1. 15 Aug, 2020 23 commits
    • Qian Cai's avatar
      mm/memcontrol: fix a data race in scan count · e0e3f42f
      Qian Cai authored
      struct mem_cgroup_per_node mz.lru_zone_size[zone_idx][lru] could be
      accessed concurrently as noticed by KCSAN,
      
       BUG: KCSAN: data-race in lruvec_lru_size / mem_cgroup_update_lru_size
      
       write to 0xffff9c804ca285f8 of 8 bytes by task 50951 on cpu 12:
        mem_cgroup_update_lru_size+0x11c/0x1d0
        mem_cgroup_update_lru_size at mm/memcontrol.c:1266
        isolate_lru_pages+0x6a9/0xf30
        shrink_active_list+0x123/0xcc0
        shrink_lruvec+0x8fd/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
        __alloc_pages_nodemask+0x3bb/0x450
        alloc_pages_vma+0x8a/0x2c0
        do_anonymous_page+0x170/0x700
        __handle_mm_fault+0xc9f/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       read to 0xffff9c804ca285f8 of 8 bytes by task 50964 on cpu 95:
        lruvec_lru_size+0xbb/0x270
        mem_cgroup_get_zone_lru_size at include/linux/memcontrol.h:536
        (inlined by) lruvec_lru_size at mm/vmscan.c:326
        shrink_lruvec+0x1d0/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
        __alloc_pages_nodemask+0x3bb/0x450
        alloc_pages_current+0xa6/0x120
        alloc_slab_page+0x3b1/0x540
        allocate_slab+0x70/0x660
        new_slab+0x46/0x70
        ___slab_alloc+0x4ad/0x7d0
        __slab_alloc+0x43/0x70
        kmem_cache_alloc+0x2c3/0x420
        getname_flags+0x4c/0x230
        getname+0x22/0x30
        do_sys_openat2+0x205/0x3b0
        do_sys_open+0x9a/0xf0
        __x64_sys_openat+0x62/0x80
        do_syscall_64+0x91/0xb47
        entry_SYSCALL_64_after_hwframe+0x49/0xbe
      
       Reported by Kernel Concurrency Sanitizer on:
       CPU: 95 PID: 50964 Comm: cc1 Tainted: G        W  O L    5.5.0-next-20200204+ #6
       Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019
      
      The write is under lru_lock, but the read is done as lockless.  The scan
      count is used to determine how aggressively the anon and file LRU lists
      should be scanned.  Load tearing could generate an inefficient heuristic,
      so fix it by adding READ_ONCE() for the read.
      Signed-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@kernel.org>
      Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
      Link: http://lkml.kernel.org/r/20200206034945.2481-1-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e0e3f42f
    • Qian Cai's avatar
      mm/page_counter: fix various data races at memsw · 6e4bd50f
      Qian Cai authored
      Commit 3e32cb2e ("mm: memcontrol: lockless page counters") could had
      memcg->memsw->watermark and memcg->memsw->failcnt been accessed
      concurrently as reported by KCSAN,
      
       BUG: KCSAN: data-race in page_counter_try_charge / page_counter_try_charge
      
       read to 0xffff8fb18c4cd190 of 8 bytes by task 1081 on cpu 59:
        page_counter_try_charge+0x4d/0x150 mm/page_counter.c:138
        try_charge+0x131/0xd50 mm/memcontrol.c:2405
        __memcg_kmem_charge_memcg+0x58/0x140
        __memcg_kmem_charge+0xcc/0x280
        __alloc_pages_nodemask+0x1e1/0x450
        alloc_pages_current+0xa6/0x120
        pte_alloc_one+0x17/0xd0
        __pte_alloc+0x3a/0x1f0
        copy_p4d_range+0xc36/0x1990
        copy_page_range+0x21d/0x360
        dup_mmap+0x5f5/0x7a0
        dup_mm+0xa2/0x240
        copy_process+0x1b3f/0x3460
        _do_fork+0xaa/0xa20
        __x64_sys_clone+0x13b/0x170
        do_syscall_64+0x91/0xb47
        entry_SYSCALL_64_after_hwframe+0x49/0xbe
      
       write to 0xffff8fb18c4cd190 of 8 bytes by task 1153 on cpu 120:
        page_counter_try_charge+0x5b/0x150 mm/page_counter.c:139
        try_charge+0x131/0xd50 mm/memcontrol.c:2405
        mem_cgroup_try_charge+0x159/0x460
        mem_cgroup_try_charge_delay+0x3d/0xa0
        wp_page_copy+0x14d/0x930
        do_wp_page+0x107/0x7b0
        __handle_mm_fault+0xce6/0xd40
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       BUG: KCSAN: data-race in page_counter_try_charge / page_counter_try_charge
      
       write to 0xffff88809bbf2158 of 8 bytes by task 11782 on cpu 0:
        page_counter_try_charge+0x100/0x170 mm/page_counter.c:129
        try_charge+0x185/0xbf0 mm/memcontrol.c:2405
        __memcg_kmem_charge_memcg+0x4a/0xe0 mm/memcontrol.c:2837
        __memcg_kmem_charge+0xcf/0x1b0 mm/memcontrol.c:2877
        __alloc_pages_nodemask+0x26c/0x310 mm/page_alloc.c:4780
      
       read to 0xffff88809bbf2158 of 8 bytes by task 11814 on cpu 1:
        page_counter_try_charge+0xef/0x170 mm/page_counter.c:129
        try_charge+0x185/0xbf0 mm/memcontrol.c:2405
        __memcg_kmem_charge_memcg+0x4a/0xe0 mm/memcontrol.c:2837
        __memcg_kmem_charge+0xcf/0x1b0 mm/memcontrol.c:2877
        __alloc_pages_nodemask+0x26c/0x310 mm/page_alloc.c:4780
      
      Since watermark could be compared or set to garbage due to a data race
      which would change the code logic, fix it by adding a pair of READ_ONCE()
      and WRITE_ONCE() in those places.
      
      The "failcnt" counter is tolerant of some degree of inaccuracy and is only
      used to report stats, a data race will not be harmful, thus mark it as an
      intentional data race using the data_race() macro.
      
      Fixes: 3e32cb2e ("mm: memcontrol: lockless page counters")
      Reported-by: syzbot+f36cfe60b1006a94f9dc@syzkaller.appspotmail.com
      Signed-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
      Cc: Marco Elver <elver@google.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Link: http://lkml.kernel.org/r/1581519682-23594-1-git-send-email-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6e4bd50f
    • Qian Cai's avatar
      mm/swapfile: fix and annotate various data races · a449bf58
      Qian Cai authored
      swap_info_struct si.highest_bit, si.swap_map[offset] and si.flags could
      be accessed concurrently separately as noticed by KCSAN,
      
      === si.highest_bit ===
      
       write to 0xffff8d5abccdc4d4 of 4 bytes by task 5353 on cpu 24:
        swap_range_alloc+0x81/0x130
        swap_range_alloc at mm/swapfile.c:681
        scan_swap_map_slots+0x371/0xb90
        get_swap_pages+0x39d/0x5c0
        get_swap_page+0xf2/0x524
        add_to_swap+0xe4/0x1c0
        shrink_page_list+0x1795/0x2870
        shrink_inactive_list+0x316/0x880
        shrink_lruvec+0x8dc/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
      
       read to 0xffff8d5abccdc4d4 of 4 bytes by task 6672 on cpu 70:
        scan_swap_map_slots+0x4a6/0xb90
        scan_swap_map_slots at mm/swapfile.c:892
        get_swap_pages+0x39d/0x5c0
        get_swap_page+0xf2/0x524
        add_to_swap+0xe4/0x1c0
        shrink_page_list+0x1795/0x2870
        shrink_inactive_list+0x316/0x880
        shrink_lruvec+0x8dc/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
      
       Reported by Kernel Concurrency Sanitizer on:
       CPU: 70 PID: 6672 Comm: oom01 Tainted: G        W    L 5.5.0-next-20200205+ #3
       Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019
      
      === si.swap_map[offset] ===
      
       write to 0xffffbc370c29a64c of 1 bytes by task 6856 on cpu 86:
        __swap_entry_free_locked+0x8c/0x100
        __swap_entry_free_locked at mm/swapfile.c:1209 (discriminator 4)
        __swap_entry_free.constprop.20+0x69/0xb0
        free_swap_and_cache+0x53/0xa0
        unmap_page_range+0x7f8/0x1d70
        unmap_single_vma+0xcd/0x170
        unmap_vmas+0x18b/0x220
        exit_mmap+0xee/0x220
        mmput+0x10e/0x270
        do_exit+0x59b/0xf40
        do_group_exit+0x8b/0x180
      
       read to 0xffffbc370c29a64c of 1 bytes by task 6855 on cpu 20:
        _swap_info_get+0x81/0xa0
        _swap_info_get at mm/swapfile.c:1140
        free_swap_and_cache+0x40/0xa0
        unmap_page_range+0x7f8/0x1d70
        unmap_single_vma+0xcd/0x170
        unmap_vmas+0x18b/0x220
        exit_mmap+0xee/0x220
        mmput+0x10e/0x270
        do_exit+0x59b/0xf40
        do_group_exit+0x8b/0x180
      
      === si.flags ===
      
       write to 0xffff956c8fc6c400 of 8 bytes by task 6087 on cpu 23:
        scan_swap_map_slots+0x6fe/0xb50
        scan_swap_map_slots at mm/swapfile.c:887
        get_swap_pages+0x39d/0x5c0
        get_swap_page+0x377/0x524
        add_to_swap+0xe4/0x1c0
        shrink_page_list+0x1795/0x2870
        shrink_inactive_list+0x316/0x880
        shrink_lruvec+0x8dc/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
      
       read to 0xffff956c8fc6c400 of 8 bytes by task 6207 on cpu 63:
        _swap_info_get+0x41/0xa0
        __swap_info_get at mm/swapfile.c:1114
        put_swap_page+0x84/0x490
        __remove_mapping+0x384/0x5f0
        shrink_page_list+0xff1/0x2870
        shrink_inactive_list+0x316/0x880
        shrink_lruvec+0x8dc/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
      
      The writes are under si->lock but the reads are not. For si.highest_bit
      and si.swap_map[offset], data race could trigger logic bugs, so fix them
      by having WRITE_ONCE() for the writes and READ_ONCE() for the reads
      except those isolated reads where they compare against zero which a data
      race would cause no harm. Thus, annotate them as intentional data races
      using the data_race() macro.
      
      For si.flags, the readers are only interested in a single bit where a
      data race there would cause no issue there.
      
      [cai@lca.pw: add a missing annotation for si->flags in memory.c]
        Link: http://lkml.kernel.org/r/1581612647-5958-1-git-send-email-cai@lca.pwSigned-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Marco Elver <elver@google.com>
      Cc: Hugh Dickins <hughd@google.com>
      Link: http://lkml.kernel.org/r/1581095163-12198-1-git-send-email-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a449bf58
    • Kirill A. Shutemov's avatar
      mm/filemap.c: fix a data race in filemap_fault() · e630bfac
      Kirill A. Shutemov authored
      struct file_ra_state ra.mmap_miss could be accessed concurrently during
      page faults as noticed by KCSAN,
      
       BUG: KCSAN: data-race in filemap_fault / filemap_map_pages
      
       write to 0xffff9b1700a2c1b4 of 4 bytes by task 3292 on cpu 30:
        filemap_fault+0x920/0xfc0
        do_sync_mmap_readahead at mm/filemap.c:2384
        (inlined by) filemap_fault at mm/filemap.c:2486
        __xfs_filemap_fault+0x112/0x3e0 [xfs]
        xfs_filemap_fault+0x74/0x90 [xfs]
        __do_fault+0x9e/0x220
        do_fault+0x4a0/0x920
        __handle_mm_fault+0xc69/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       read to 0xffff9b1700a2c1b4 of 4 bytes by task 3313 on cpu 32:
        filemap_map_pages+0xc2e/0xd80
        filemap_map_pages at mm/filemap.c:2625
        do_fault+0x3da/0x920
        __handle_mm_fault+0xc69/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       Reported by Kernel Concurrency Sanitizer on:
       CPU: 32 PID: 3313 Comm: systemd-udevd Tainted: G        W    L 5.5.0-next-20200210+ #1
       Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019
      
      ra.mmap_miss is used to contribute the readahead decisions, a data race
      could be undesirable.  Both the read and write is only under non-exclusive
      mmap_sem, two concurrent writers could even underflow the counter.  Fix
      the underflow by writing to a local variable before committing a final
      store to ra.mmap_miss given a small inaccuracy of the counter should be
      acceptable.
      Signed-off-by: default avatarKirill A. Shutemov <kirill@shutemov.name>
      Signed-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Tested-by: default avatarQian Cai <cai@lca.pw>
      Reviewed-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Cc: Marco Elver <elver@google.com>
      Link: http://lkml.kernel.org/r/20200211030134.1847-1-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e630bfac
    • Qian Cai's avatar
      mm/swap_state: mark various intentional data races · b96a3db2
      Qian Cai authored
      swap_cache_info.* could be accessed concurrently as noticed by
      KCSAN,
      
       BUG: KCSAN: data-race in lookup_swap_cache / lookup_swap_cache
      
       write to 0xffffffff85517318 of 8 bytes by task 94138 on cpu 101:
        lookup_swap_cache+0x12e/0x460
        lookup_swap_cache at mm/swap_state.c:322
        do_swap_page+0x112/0xeb0
        __handle_mm_fault+0xc7a/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       read to 0xffffffff85517318 of 8 bytes by task 91655 on cpu 100:
        lookup_swap_cache+0x117/0x460
        lookup_swap_cache at mm/swap_state.c:322
        shmem_swapin_page+0xc7/0x9e0
        shmem_getpage_gfp+0x2ca/0x16c0
        shmem_fault+0xef/0x3c0
        __do_fault+0x9e/0x220
        do_fault+0x4a0/0x920
        __handle_mm_fault+0xc69/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       Reported by Kernel Concurrency Sanitizer on:
       CPU: 100 PID: 91655 Comm: systemd-journal Tainted: G        W  O L 5.5.0-next-20200204+ #6
       Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019
      
       write to 0xffffffff8d717308 of 8 bytes by task 11365 on cpu 87:
         __delete_from_swap_cache+0x681/0x8b0
         __delete_from_swap_cache at mm/swap_state.c:178
      
       read to 0xffffffff8d717308 of 8 bytes by task 11275 on cpu 53:
         __delete_from_swap_cache+0x66e/0x8b0
         __delete_from_swap_cache at mm/swap_state.c:178
      
      Both the read and write are done as lockless. Since swap_cache_info.*
      are only used to print out counter information, even if any of them
      missed a few incremental due to data races, it will be harmless, so just
      mark it as an intentional data race using the data_race() macro.
      
      While at it, fix a checkpatch.pl warning,
      
      WARNING: Single statement macros should not use a do {} while (0) loop
      Signed-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Marco Elver <elver@google.com>
      Link: http://lkml.kernel.org/r/20200207003715.1578-1-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b96a3db2
    • Qian Cai's avatar
      mm/page_io: mark various intentional data races · 7b37e226
      Qian Cai authored
      struct swap_info_struct si.flags could be accessed concurrently as noticed
      by KCSAN,
      
       BUG: KCSAN: data-race in scan_swap_map_slots / swap_readpage
      
       write to 0xffff9c77b80ac400 of 8 bytes by task 91325 on cpu 16:
        scan_swap_map_slots+0x6fe/0xb50
        scan_swap_map_slots at mm/swapfile.c:887
        get_swap_pages+0x39d/0x5c0
        get_swap_page+0x377/0x524
        add_to_swap+0xe4/0x1c0
        shrink_page_list+0x1740/0x2820
        shrink_inactive_list+0x316/0x8b0
        shrink_lruvec+0x8dc/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
        __alloc_pages_nodemask+0x3bb/0x450
        alloc_pages_vma+0x8a/0x2c0
        do_anonymous_page+0x170/0x700
        __handle_mm_fault+0xc9f/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       read to 0xffff9c77b80ac400 of 8 bytes by task 5422 on cpu 7:
        swap_readpage+0x204/0x6a0
        swap_readpage at mm/page_io.c:380
        read_swap_cache_async+0xa2/0xb0
        swapin_readahead+0x6a0/0x890
        do_swap_page+0x465/0xeb0
        __handle_mm_fault+0xc7a/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       Reported by Kernel Concurrency Sanitizer on:
       CPU: 7 PID: 5422 Comm: gmain Tainted: G        W  O L 5.5.0-next-20200204+ #6
       Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385 Gen10, BIOS A40 07/10/2019
      
      Other reads,
      
       read to 0xffff91ea33eac400 of 8 bytes by task 11276 on cpu 120:
        __swap_writepage+0x140/0xc20
        __swap_writepage at mm/page_io.c:289
      
       read to 0xffff91ea33eac400 of 8 bytes by task 11264 on cpu 16:
        swap_set_page_dirty+0x44/0x1f4
        swap_set_page_dirty at mm/page_io.c:442
      
      The write is under &si->lock, but the reads are done as lockless.  Since
      the reads only check for a specific bit in the flag, it is harmless even
      if load tearing happens.  Thus, just mark them as intentional data races
      using the data_race() macro.
      
      [cai@lca.pw: add a missing annotation]
        Link: http://lkml.kernel.org/r/1581612585-5812-1-git-send-email-cai@lca.pwSigned-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Marco Elver <elver@google.com>
      Link: http://lkml.kernel.org/r/20200207003601.1526-1-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7b37e226
    • Qian Cai's avatar
      mm/frontswap: mark various intentional data races · 96bdd2bc
      Qian Cai authored
      There are a few information counters that are intentionally not protected
      against increment races, so just annotate them using the data_race()
      macro.
      
       BUG: KCSAN: data-race in __frontswap_store / __frontswap_store
      
       write to 0xffffffff8b7174d8 of 8 bytes by task 6396 on cpu 103:
        __frontswap_store+0x2d0/0x344
        inc_frontswap_failed_stores at mm/frontswap.c:70
        (inlined by) __frontswap_store at mm/frontswap.c:280
        swap_writepage+0x83/0xf0
        pageout+0x33e/0xae0
        shrink_page_list+0x1f57/0x2870
        shrink_inactive_list+0x316/0x880
        shrink_lruvec+0x8dc/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
        __alloc_pages_nodemask+0x3bb/0x450
        alloc_pages_vma+0x8a/0x2c0
        do_anonymous_page+0x170/0x700
        __handle_mm_fault+0xc9f/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       read to 0xffffffff8b7174d8 of 8 bytes by task 6405 on cpu 47:
        __frontswap_store+0x2b9/0x344
        inc_frontswap_failed_stores at mm/frontswap.c:70
        (inlined by) __frontswap_store at mm/frontswap.c:280
        swap_writepage+0x83/0xf0
        pageout+0x33e/0xae0
        shrink_page_list+0x1f57/0x2870
        shrink_inactive_list+0x316/0x880
        shrink_lruvec+0x8dc/0x1380
        shrink_node+0x317/0xd80
        do_try_to_free_pages+0x1f7/0xa10
        try_to_free_pages+0x26c/0x5e0
        __alloc_pages_slowpath+0x458/0x1290
        __alloc_pages_nodemask+0x3bb/0x450
        alloc_pages_vma+0x8a/0x2c0
        do_anonymous_page+0x170/0x700
        __handle_mm_fault+0xc9f/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      Signed-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Marco Elver <elver@google.com>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Link: http://lkml.kernel.org/r/1581114499-5042-1-git-send-email-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      96bdd2bc
    • Qian Cai's avatar
      mm/kmemleak: silence KCSAN splats in checksum · 69d0b54d
      Qian Cai authored
      Even if KCSAN is disabled for kmemleak, update_checksum() could still call
      crc32() (which is outside of kmemleak.c) to dereference object->pointer.
      Thus, the value of object->pointer could be accessed concurrently as
      noticed by KCSAN,
      
       BUG: KCSAN: data-race in crc32_le_base / do_raw_spin_lock
      
       write to 0xffffb0ea683a7d50 of 4 bytes by task 23575 on cpu 12:
        do_raw_spin_lock+0x114/0x200
        debug_spin_lock_after at kernel/locking/spinlock_debug.c:91
        (inlined by) do_raw_spin_lock at kernel/locking/spinlock_debug.c:115
        _raw_spin_lock+0x40/0x50
        __handle_mm_fault+0xa9e/0xd00
        handle_mm_fault+0xfc/0x2f0
        do_page_fault+0x263/0x6f9
        page_fault+0x34/0x40
      
       read to 0xffffb0ea683a7d50 of 4 bytes by task 839 on cpu 60:
        crc32_le_base+0x67/0x350
        crc32_le_base+0x67/0x350:
        crc32_body at lib/crc32.c:106
        (inlined by) crc32_le_generic at lib/crc32.c:179
        (inlined by) crc32_le at lib/crc32.c:197
        kmemleak_scan+0x528/0xd90
        update_checksum at mm/kmemleak.c:1172
        (inlined by) kmemleak_scan at mm/kmemleak.c:1497
        kmemleak_scan_thread+0xcc/0xfa
        kthread+0x1e0/0x200
        ret_from_fork+0x27/0x50
      
      If a shattered value was returned due to a data race, it will be corrected
      in the next scan.  Thus, let KCSAN ignore all reads in the region to
      silence KCSAN in case the write side is non-atomic.
      Suggested-by: default avatarMarco Elver <elver@google.com>
      Signed-off-by: default avatarQian Cai <cai@lca.pw>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: default avatarMarco Elver <elver@google.com>
      Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Link: http://lkml.kernel.org/r/20200317182754.2180-1-cai@lca.pwSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      69d0b54d
    • Xiaoming Ni's avatar
      all arch: remove system call sys_sysctl · 88db0aa2
      Xiaoming Ni authored
      Since commit 61a47c1a ("sysctl: Remove the sysctl system call"),
      sys_sysctl is actually unavailable: any input can only return an error.
      
      We have been warning about people using the sysctl system call for years
      and believe there are no more users.  Even if there are users of this
      interface if they have not complained or fixed their code by now they
      probably are not going to, so there is no point in warning them any
      longer.
      
      So completely remove sys_sysctl on all architectures.
      
      [nixiaoming@huawei.com: s390: fix build error for sys_call_table_emu]
       Link: http://lkml.kernel.org/r/20200618141426.16884-1-nixiaoming@huawei.comSigned-off-by: default avatarXiaoming Ni <nixiaoming@huawei.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Acked-by: Will Deacon <will@kernel.org>		[arm/arm64]
      Acked-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
      Cc: Aleksa Sarai <cyphar@cyphar.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Bin Meng <bin.meng@windriver.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: chenzefeng <chenzefeng2@huawei.com>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Cc: Christian Brauner <christian@brauner.io>
      Cc: Chris Zankel <chris@zankel.net>
      Cc: David Howells <dhowells@redhat.com>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Diego Elio Pettenò <flameeyes@flameeyes.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Dominik Brodowski <linux@dominikbrodowski.net>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Helge Deller <deller@gmx.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Iurii Zaikin <yzaikin@google.com>
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
      Cc: Jens Axboe <axboe@kernel.dk>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Kars de Jong <jongk@linux-m68k.org>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Krzysztof Kozlowski <krzk@kernel.org>
      Cc: Luis Chamberlain <mcgrof@kernel.org>
      Cc: Marco Elver <elver@google.com>
      Cc: Mark Rutland <mark.rutland@arm.com>
      Cc: Martin K. Petersen <martin.petersen@oracle.com>
      Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
      Cc: Matt Turner <mattst88@gmail.com>
      Cc: Max Filippov <jcmvbkbc@gmail.com>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Michal Simek <monstr@monstr.eu>
      Cc: Miklos Szeredi <mszeredi@redhat.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
      Cc: Nick Piggin <npiggin@gmail.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Olof Johansson <olof@lixom.net>
      Cc: Paul Burton <paulburton@kernel.org>
      Cc: "Paul E. McKenney" <paulmck@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Randy Dunlap <rdunlap@infradead.org>
      Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Rich Felker <dalias@libc.org>
      Cc: Russell King <linux@armlinux.org.uk>
      Cc: Sami Tolvanen <samitolvanen@google.com>
      Cc: Sargun Dhillon <sargun@sargun.me>
      Cc: Stephen Rothwell <sfr@canb.auug.org.au>
      Cc: Sudeep Holla <sudeep.holla@arm.com>
      Cc: Sven Schnelle <svens@stackframe.org>
      Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
      Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: Vasily Gorbik <gor@linux.ibm.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Zhou Yanjie <zhouyanjie@wanyeetech.com>
      Link: http://lkml.kernel.org/r/20200616030734.87257-1-nixiaoming@huawei.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      88db0aa2
    • Randy Dunlap's avatar
    • Matthew Wilcox (Oracle)'s avatar
      mm: introduce offset_in_thp · ee6c400f
      Matthew Wilcox (Oracle) authored
      Mirroring offset_in_page(), this gives you the offset within this
      particular page, no matter what size page it is.  It optimises down to
      offset_in_page() if CONFIG_TRANSPARENT_HUGEPAGE is not set.
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
      Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Link: http://lkml.kernel.org/r/20200629151959.15779-8-willy@infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ee6c400f
    • Matthew Wilcox (Oracle)'s avatar
      mm: add thp_head · 2be1d718
      Matthew Wilcox (Oracle) authored
      This is like compound_head() but compiles away when
      CONFIG_TRANSPARENT_HUGEPAGE is not enabled.
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Link: http://lkml.kernel.org/r/20200629151959.15779-7-willy@infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2be1d718
    • Matthew Wilcox (Oracle)'s avatar
      mm: replace hpage_nr_pages with thp_nr_pages · 6c357848
      Matthew Wilcox (Oracle) authored
      The thp prefix is more frequently used than hpage and we should be
      consistent between the various functions.
      
      [akpm@linux-foundation.org: fix mm/migrate.c]
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Link: http://lkml.kernel.org/r/20200629151959.15779-6-willy@infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6c357848
    • Matthew Wilcox (Oracle)'s avatar
      mm: add thp_size · af3bbc12
      Matthew Wilcox (Oracle) authored
      This function returns the number of bytes in a THP.  It is like
      page_size(), but compiles to just PAGE_SIZE if CONFIG_TRANSPARENT_HUGEPAGE
      is disabled.
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Link: http://lkml.kernel.org/r/20200629151959.15779-5-willy@infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      af3bbc12
    • Matthew Wilcox (Oracle)'s avatar
      mm: add thp_order · 6ffbb458
      Matthew Wilcox (Oracle) authored
      This function returns the order of a transparent huge page.  It compiles
      to 0 if CONFIG_TRANSPARENT_HUGEPAGE is disabled.
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Link: http://lkml.kernel.org/r/20200629151959.15779-4-willy@infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6ffbb458
    • Matthew Wilcox (Oracle)'s avatar
      mm: move page-flags include to top of file · 41901567
      Matthew Wilcox (Oracle) authored
      Give up on the notion that we can remove page-flags.h from mm.h.  There
      are currently 14 inline functions which use a PageFoo function.  Also, two
      of the files directly included by mm.h include page-flags.h themselves,
      and there are probably more indirect inclusions.  So just include it at
      the top like any other header file.
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Link: http://lkml.kernel.org/r/20200629151959.15779-3-willy@infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      41901567
    • Matthew Wilcox (Oracle)'s avatar
      mm: store compound_nr as well as compound_order · 1378a5ee
      Matthew Wilcox (Oracle) authored
      Patch series "THP prep patches".
      
      These are some generic cleanups and improvements, which I would like
      merged into mmotm soon.  The first one should be a performance improvement
      for all users of compound pages, and the others are aimed at getting code
      to compile away when CONFIG_TRANSPARENT_HUGEPAGE is disabled (ie small
      systems).  Also better documented / less confusing than the current prefix
      mixture of compound, hpage and thp.
      
      This patch (of 7):
      
      This removes a few instructions from functions which need to know how many
      pages are in a compound page.  The storage used is either page->mapping on
      64-bit or page->index on 32-bit.  Both of these are fine to overlay on
      tail pages.
      Signed-off-by: default avatarMatthew Wilcox (Oracle) <willy@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarWilliam Kucharski <william.kucharski@oracle.com>
      Reviewed-by: default avatarZi Yan <ziy@nvidia.com>
      Cc: David Hildenbrand <david@redhat.com>
      Cc: Mike Kravetz <mike.kravetz@oracle.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Link: http://lkml.kernel.org/r/20200629151959.15779-1-willy@infradead.org
      Link: http://lkml.kernel.org/r/20200629151959.15779-2-willy@infradead.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1378a5ee
    • Greg Kurz's avatar
      mailmap: add entry for Greg Kurz · 14a36a43
      Greg Kurz authored
      I had stopped using gkurz@linux.vnet.ibm.com a while back already but this
      email address was shutdown last June when I quit IBM.  It's about time to
      map it to groug@kaod.org.
      Signed-off-by: default avatarGreg Kurz <groug@kaod.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Link: http://lkml.kernel.org/r/159724692879.76040.4938578139173154028.stgit@bahia.lanSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      14a36a43
    • Kees Cook's avatar
      selftests/exec: add file type errno tests · 0f71241a
      Kees Cook authored
      Make sure execve() returns the expected errno values for non-regular
      files.
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Marc Zyngier <maz@kernel.org>
      Link: http://lkml.kernel.org/r/20200813231723.2725102-3-keescook@chromium.orgSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0f71241a
    • Kees Cook's avatar
      exec: restore EACCES of S_ISDIR execve() · fc4177be
      Kees Cook authored
      Patch series "Fix S_ISDIR execve() errno".
      
      Fix an errno change for execve() of directories, noticed by Marc Zyngier.
      Along with the fix, include a regression test to avoid seeing this return
      in the future.
      
      This patch (of 2):
      
      The return code for attempting to execute a directory has always been
      EACCES.  Adjust the S_ISDIR exec test to reflect the old errno instead of
      the general EISDIR for other kinds of "open" attempts on directories.
      
      Fixes: 633fb6ac ("exec: move S_ISREG() check earlier")
      Reported-by: default avatarMarc Zyngier <maz@kernel.org>
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Tested-by: default avatarGreg Kroah-Hartman <gregkh@android.com>
      Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
      Link: http://lkml.kernel.org/r/20200813231723.2725102-2-keescook@chromium.org
      Link: https://lore.kernel.org/lkml/20200813151305.6191993b@whySigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fc4177be
    • Nick Terrell's avatar
      lz4: fix kernel decompression speed · b1a3e75e
      Nick Terrell authored
      This patch replaces all memcpy() calls with LZ4_memcpy() which calls
      __builtin_memcpy() so the compiler can inline it.
      
      LZ4 relies heavily on memcpy() with a constant size being inlined.  In x86
      and i386 pre-boot environments memcpy() cannot be inlined because memcpy()
      doesn't get defined as __builtin_memcpy().
      
      An equivalent patch has been applied upstream so that the next import
      won't lose this change [1].
      
      I've measured the kernel decompression speed using QEMU before and after
      this patch for the x86_64 and i386 architectures.  The speed-up is about
      10x as shown below.
      
      Code	Arch	Kernel Size	Time	Speed
      v5.8	x86_64	11504832 B	148 ms	 79 MB/s
      patch	x86_64	11503872 B	 13 ms	885 MB/s
      v5.8	i386	 9621216 B	 91 ms	106 MB/s
      patch	i386	 9620224 B	 10 ms	962 MB/s
      
      I also measured the time to decompress the initramfs on x86_64, i386, and
      arm.  All three show the same decompression speed before and after, as
      expected.
      
      [1] https://github.com/lz4/lz4/pull/890Signed-off-by: default avatarNick Terrell <terrelln@fb.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Cc: Yann Collet <yann.collet.73@gmail.com>
      Cc: Gao Xiang <gaoxiang25@huawei.com>
      Cc: Sven Schmidt <4sschmid@informatik.uni-hamburg.de>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Arvind Sankar <nivedita@alum.mit.edu>
      Link: http://lkml.kernel.org/r/20200803194022.2966806-1-nickrterrell@gmail.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b1a3e75e
    • Baoquan He's avatar
      Revert "mm/vmstat.c: do not show lowmem reserve protection information of empty zone" · a8a4b7ae
      Baoquan He authored
      This reverts commit 26e7dead.
      
      Sonny reported that one of their tests started failing on the latest
      kernel on their Chrome OS platform.  The root cause is that the above
      commit removed the protection line of empty zone, while the parser used in
      the test relies on the protection line to mark the end of each zone.
      
      Let's revert it to avoid breaking userspace testing or applications.
      
      Fixes: 26e7dead ("mm/vmstat.c: do not show lowmem reserve protection information of empty zone)"
      Reported-by: default avatarSonny Rao <sonnyrao@chromium.org>
      Signed-off-by: default avatarBaoquan He <bhe@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: <stable@vger.kernel.org>	[5.8.x]
      Link: http://lkml.kernel.org/r/20200811075412.12872-1-bhe@redhat.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a8a4b7ae
    • Mike Rapoport's avatar
      asm-generic: pgalloc.h: use correct #ifdef to enable pud_alloc_one() · 9922c1de
      Mike Rapoport authored
      The #ifdef statement that guards the generic version of pud_alloc_one() by
      mistake used __HAVE_ARCH_PUD_FREE instead of __HAVE_ARCH_PUD_ALLOC_ONE.
      
      Fix it.
      
      Fixes: d9e8b929 ("asm-generic: pgalloc: provide generic pud_alloc_one() and pud_free_one()")
      Reported-by: default avatarkernel test robot <lkp@intel.com>
      Signed-off-by: default avatarMike Rapoport <rppt@linux.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Link: http://lkml.kernel.org/r/20200812191415.GE163101@linux.ibm.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9922c1de
  2. 14 Aug, 2020 17 commits
    • Linus Torvalds's avatar
      Merge tag 'timers-urgent-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · b923f124
      Linus Torvalds authored
      Pull timekeeping updates from Thomas Gleixner:
       "A set of timekeeping/VDSO updates:
      
         - Preparatory work to allow S390 to switch over to the generic VDSO
           implementation.
      
           S390 requires that the VDSO data pointer is handed in to the
           counter read function when time namespace support is enabled.
           Adding the pointer is a NOOP for all other architectures because
           the compiler is supposed to optimize that out when it is unused in
           the architecture specific inline. The change also solved a similar
           problem for MIPS which fortunately has time namespaces not yet
           enabled.
      
           S390 needs to update clock related VDSO data independent of the
           timekeeping updates. This was solved so far with yet another
           sequence counter in the S390 implementation. A better solution is
           to utilize the already existing VDSO sequence count for this. The
           core code now exposes helper functions which allow to serialize
           against the timekeeper code and against concurrent readers.
      
           S390 needs extra data for their clock readout function. The initial
           common VDSO data structure did not provide a way to add that. It
           now has an embedded architecture specific struct embedded which
           defaults to an empty struct.
      
           Doing this now avoids tree dependencies and conflicts post rc1 and
           allows all other architectures which work on generic VDSO support
           to work from a common upstream base.
      
         - A trivial comment fix"
      
      * tag 'timers-urgent-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        time: Delete repeated words in comments
        lib/vdso: Allow to add architecture-specific vdso data
        timekeeping/vsyscall: Provide vdso_update_begin/end()
        vdso/treewide: Add vdso_data pointer argument to __arch_get_hw_counter()
      b923f124
    • Linus Torvalds's avatar
      Merge tag 'timers-core-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · b6b178e3
      Linus Torvalds authored
      Pull more timer updates from Thomas Gleixner:
       "A set of posix CPU timer changes which allows to defer the heavy work
        of posix CPU timers into task work context. The tick interrupt is
        reduced to a quick check which queues the work which is doing the
        heavy lifting before returning to user space or going back to guest
        mode. Moving this out is deferring the signal delivery slightly but
        posix CPU timers are inaccurate by nature as they depend on the tick
        so there is no real damage. The relevant test cases all passed.
      
        This lifts the last offender for RT out of the hard interrupt context
        tick handler, but it also has the general benefit that the actual
        heavy work is accounted to the task/process and not to the tick
        interrupt itself.
      
        Further optimizations are possible to break long sighand lock hold and
        interrupt disabled (on !RT kernels) times when a massive amount of
        posix CPU timers (which are unpriviledged) is armed for a
        task/process.
      
        This is currently only enabled for x86 because the architecture has to
        ensure that task work is handled in KVM before entering a guest, which
        was just established for x86 with the new common entry/exit code which
        got merged post 5.8 and is not the case for other KVM architectures"
      
      * tag 'timers-core-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86: Select POSIX_CPU_TIMERS_TASK_WORK
        posix-cpu-timers: Provide mechanisms to defer timer handling to task_work
        posix-cpu-timers: Split run_posix_cpu_timers()
      b6b178e3
    • Linus Torvalds's avatar
      Merge tag 'irq-urgent-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 1d229a65
      Linus Torvalds authored
      Pull irq fixes from Thomas Gleixner:
       "Two fixes in the core interrupt code which ensure that all error exits
        unlock the descriptor lock"
      
      * tag 'irq-urgent-2020-08-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        genirq: Unlock irq descriptor after errors
        genirq/PM: Always unlock IRQ descriptor in rearm_wake_irq()
      1d229a65
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://github.com/openrisc/linux · e1d74fbe
      Linus Torvalds authored
      Pull OpenRISC updates from Stafford Horne:
       "A few patches all over the place during this cycle, mostly bug and
        sparse warning fixes for OpenRISC, but a few enhancements too. Note,
        there are 2 non OpenRISC specific fixups.
      
        Non OpenRISC fixes:
      
         - In init we need to align the init_task correctly to fix an issue
           with MUTEX_FLAGS, reviewed by Peter Z. No one picked this up so I
           kept it on my tree.
      
         - In asm-generic/io.h I fixed up some sparse warnings, OK'd by Arnd.
           Arnd asked to merge it via my tree.
      
        OpenRISC fixes:
      
         - Many fixes for OpenRISC sprase warnings.
      
         - Add support OpenRISC SMP tlb flushing rather than always flushing
           the entire TLB on every CPU.
      
         - Fix bug when dumping stack via /proc/xxx/stack of user threads"
      
      * tag 'for-linus' of git://github.com/openrisc/linux:
        openrisc: uaccess: Add user address space check to access_ok
        openrisc: signal: Fix sparse address space warnings
        openrisc: uaccess: Remove unused macro __addr_ok
        openrisc: uaccess: Use static inline function in access_ok
        openrisc: uaccess: Fix sparse address space warnings
        openrisc: io: Fixup defines and move include to the end
        asm-generic/io.h: Fix sparse warnings on big-endian architectures
        openrisc: Implement proper SMP tlb flushing
        openrisc: Fix oops caused when dumping stack
        openrisc: Add support for external initrd images
        init: Align init_task to avoid conflict with MUTEX_FLAGS
        openrisc: fix __user in raw_copy_to_user()'s prototype
      e1d74fbe
    • Linus Torvalds's avatar
      Merge tag 'powerpc-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 7fca4dee
      Linus Torvalds authored
      Pull powerpc fix from Michael Ellerman:
       "One fix for a boot crash on some platforms introduced by the recent
        pkey refactoring.
      
        Thanks to Christian Zigotzky and Aneesh Kumar K.V"
      
      * tag 'powerpc-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/pkeys: Fix boot failures with Nemo board (A-EON AmigaOne X1000)
      7fca4dee
    • Linus Torvalds's avatar
      Merge tag 'for-linus-5.9-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip · 0520058d
      Linus Torvalds authored
      Pull more xen updates from Juergen Gross:
      
       - Remove support for running as 32-bit Xen PV-guest.
      
         32-bit PV guests are rarely used, are lacking security fixes for
         Meltdown, and can be easily replaced by PVH mode. Another series for
         doing more cleanup will follow soon (removal of 32-bit-only pvops
         functionality).
      
       - Fixes and additional features for the Xen display frontend driver.
      
      * tag 'for-linus-5.9-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
        drm/xen-front: Pass dumb buffer data offset to the backend
        xen: Sync up with the canonical protocol definition in Xen
        drm/xen-front: Add YUYV to supported formats
        drm/xen-front: Fix misused IS_ERR_OR_NULL checks
        xen/gntdev: Fix dmabuf import with non-zero sgt offset
        x86/xen: drop tests for highmem in pv code
        x86/xen: eliminate xen-asm_64.S
        x86/xen: remove 32-bit Xen PV guest support
      0520058d
    • Linus Torvalds's avatar
      Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux · cd94257d
      Linus Torvalds authored
      Pull hyper-v fixes from Wei Liu:
      
       - fix oops reporting on Hyper-V
      
       - make objtool happy
      
      * tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
        x86/hyperv: Make hv_setup_sched_clock inline
        Drivers: hv: vmbus: Only notify Hyper-V for die events that are oops
      cd94257d
    • Eric Dumazet's avatar
      x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task · 8ab49526
      Eric Dumazet authored
      syzbot found its way in 86_fsgsbase_read_task() and triggered this oops:
      
         KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
         CPU: 0 PID: 6866 Comm: syz-executor262 Not tainted 5.8.0-syzkaller #0
         RIP: 0010:x86_fsgsbase_read_task+0x16d/0x310 arch/x86/kernel/process_64.c:393
         Call Trace:
           putreg32+0x3ab/0x530 arch/x86/kernel/ptrace.c:876
           genregs32_set arch/x86/kernel/ptrace.c:1026 [inline]
           genregs32_set+0xa4/0x100 arch/x86/kernel/ptrace.c:1006
           copy_regset_from_user include/linux/regset.h:326 [inline]
           ia32_arch_ptrace arch/x86/kernel/ptrace.c:1061 [inline]
           compat_arch_ptrace+0x36c/0xd90 arch/x86/kernel/ptrace.c:1198
           __do_compat_sys_ptrace kernel/ptrace.c:1420 [inline]
           __se_compat_sys_ptrace kernel/ptrace.c:1389 [inline]
           __ia32_compat_sys_ptrace+0x220/0x2f0 kernel/ptrace.c:1389
           do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline]
           __do_fast_syscall_32+0x57/0x80 arch/x86/entry/common.c:126
           do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:149
           entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
      
      This can happen if ptrace() or sigreturn() pokes an LDT selector into FS
      or GS for a task with no LDT and something tries to read the base before
      a return to usermode notices the bad selector and fixes it.
      
      The fix is to make sure ldt pointer is not NULL.
      
      Fixes: 07e1d88a ("x86/fsgsbase/64: Fix ptrace() to read the FS/GS base accurately")
      Co-developed-by: default avatarJann Horn <jannh@google.com>
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Reported-by: default avatarsyzbot <syzkaller@googlegroups.com>
      Acked-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Chang S. Bae <chang.seok.bae@intel.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Markus T Metzger <markus.t.metzger@intel.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Ravi Shankar <ravi.v.shankar@intel.com>
      Cc: Rik van Riel <riel@surriel.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8ab49526
    • Linus Torvalds's avatar
      Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 · d9361cb2
      Linus Torvalds authored
      Pull crypto fix from Herbert Xu:
       "This fixes a regression in af_alg"
      
      * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
        crypto: algif_aead - fix uninitialized ctx->init
      d9361cb2
    • Linus Torvalds's avatar
      Merge tag 'modules-for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux · 0fd9cc6b
      Linus Torvalds authored
      Pull module updates from Jessica Yu:
       "The most important change would be Christoph Hellwig's patch
        implementing proprietary taint inheritance, in an effort to discourage
        the creation of GPL "shim" modules that interface between GPL symbols
        and proprietary symbols.
      
        Summary:
      
         - Have modules that use symbols from proprietary modules inherit the
           TAINT_PROPRIETARY_MODULE taint, in an effort to prevent GPL shim
           modules that are used to circumvent _GPL exports. These are modules
           that claim to be GPL licensed while also using symbols from
           proprietary modules. Such modules will be rejected while non-GPL
           modules will inherit the proprietary taint.
      
         - Module export space cleanup. Unexport symbols that are unused
           outside of module.c or otherwise used in only built-in code"
      
      * tag 'modules-for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
        modules: inherit TAINT_PROPRIETARY_MODULE
        modules: return licensing information from find_symbol
        modules: rename the licence field in struct symsearch to license
        modules: unexport __module_address
        modules: unexport __module_text_address
        modules: mark each_symbol_section static
        modules: mark find_symbol static
        modules: mark ref_module static
        modules: linux/moduleparam.h: drop duplicated word in a comment
      0fd9cc6b
    • Linus Torvalds's avatar
      Merge tag 'kconfig-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild · 32b2ee5c
      Linus Torvalds authored
      Pull Kconfig updates from Masahiro Yamada:
      
       - remove '---help---' keyword support
      
       - fix mouse events for 'menuconfig' symbols in search view of qconf
      
       - code cleanups of qconf
      
      * tag 'kconfig-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (24 commits)
        kconfig: qconf: move setOptionMode() to ConfigList from ConfigView
        kconfig: qconf: do not limit the pop-up menu to the first row
        kconfig: qconf: refactor icon setups
        kconfig: qconf: remove unused voidPix, menuInvPix
        kconfig: qconf: remove ConfigItem::text/setText
        kconfig: qconf: remove ConfigList::addColumn/removeColumn
        kconfig: qconf: remove ConfigItem::pixmap/setPixmap
        kconfig: qconf: drop more localization code
        kconfig: qconf: remove 'parent' from ConfigList::updateMenuList()
        kconfig: qconf: remove unused argument from ConfigView::updateList()
        kconfig: qconf: remove unused argument from ConfigList::updateList()
        kconfig: qconf: omit parent to QHBoxLayout()
        kconfig: qconf: remove name from ConfigSearchWindow constructor
        kconfig: qconf: remove unused ConfigList::listView()
        kconfig: qconf: overload addToolBar() to create and insert toolbar
        kconfig: qconf: remove toolBar from ConfigMainWindow members
        kconfig: qconf: use 'menu' variable for (QMenu *)
        kconfig: qconf: do not use 'menu' variable for (QMenuBar *)
        kconfig: qconf: remove ->addSeparator() to menuBar
        kconfig: add 'static' to some file-local data
        ...
      32b2ee5c
    • Masahiro Yamada's avatar
      kconfig: qconf: move setOptionMode() to ConfigList from ConfigView · d4bbe8a1
      Masahiro Yamada authored
      ConfigView::setOptionMode() only gets access to the 'list' member.
      
      Move it to the more relevant ConfigList class.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      d4bbe8a1
    • Masahiro Yamada's avatar
      kconfig: qconf: do not limit the pop-up menu to the first row · fa8de0a3
      Masahiro Yamada authored
      If you right-click the first row in the option tree, the pop-up menu
      shows up, but if you right-click the second row or below, the event
      is ignored due to the following check:
      
        if (e->y() <= header()->geometry().bottom()) {
      
      Perhaps, the intention was to show the pop-menu only when the tree
      header was right-clicked, but this handler is not called in that case.
      
      Since the origin of e->y() starts from the bottom of the header,
      this check is odd.
      
      Going forward, you can right-click anywhere in the tree to get the
      pop-up menu.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      fa8de0a3
    • Masahiro Yamada's avatar
      kconfig: qconf: refactor icon setups · 5cb255ff
      Masahiro Yamada authored
      These icon data are used by ConfigItem, but stored in each instance
      of ConfigView. There is no point to keep the same data in each of 3
      instances, "menu", "config", and "search".
      
      Move the icon data to the more relevant ConfigItem class, and make
      them static members.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      5cb255ff
    • Masahiro Yamada's avatar
      kconfig: qconf: remove unused voidPix, menuInvPix · 4fa91f52
      Masahiro Yamada authored
      These are initialized, but not used by anyone.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      4fa91f52
    • Masahiro Yamada's avatar
      kconfig: qconf: remove ConfigItem::text/setText · 5ca534cd
      Masahiro Yamada authored
      Use QTreeWidgetItem::text/setText directly
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      5ca534cd
    • Masahiro Yamada's avatar
      kconfig: qconf: remove ConfigList::addColumn/removeColumn · abf741a9
      Masahiro Yamada authored
      Use QTreeView::showColumn/hideColumn directly.
      Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
      abf741a9