1. 06 Jul, 2015 4 commits
    • Andy Lutomirski's avatar
      x86/asm/tsc, x86/paravirt: Remove read_tsc() and read_tscp() paravirt hooks · 9261e050
      Andy Lutomirski authored
      We've had ->read_tsc() and ->read_tscp() paravirt hooks since
      the very beginning of paravirt, i.e.,
      
        d3561b7f ("[PATCH] paravirt: header and stubs for paravirtualisation").
      
      AFAICT, the only paravirt guest implementation that ever
      replaced these calls was vmware, and it's gone. Arguably even
      vmware shouldn't have hooked RDTSC -- we fully support systems
      that don't have a TSC at all, so there's no point for a paravirt
      implementation to pretend that we have a TSC but to replace it.
      
      I also doubt that these hooks actually worked. Calls to rdtscl()
      and rdtscll(), which respected the hooks, were used seemingly
      interchangeably with native_read_tsc(), which did not.
      
      Just remove them. If anyone ever needs them again, they can try
      to make a case for why they need them.
      
      Before, on a paravirt config:
        text    	data     bss     dec     hex filename
        12618257      1816384 1093632 15528273 ecf151 vmlinux
      
      After:
        text		data     bss     dec     hex filename
        12617207      1816384 1093632 15527223 eced37 vmlinux
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Huang Rui <ray.huang@amd.com>
      Cc: John Stultz <john.stultz@linaro.org>
      Cc: Len Brown <lenb@kernel.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: kvm ML <kvm@vger.kernel.org>
      Cc: virtualization@lists.linux-foundation.org
      Link: http://lkml.kernel.org/r/d08a2600fb298af163681e5efd8e599d889a5b97.1434501121.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      9261e050
    • Andy Lutomirski's avatar
      x86/asm/tsc, kvm: Remove vget_cycles() · 881d7bf8
      Andy Lutomirski authored
      The only caller was KVM's read_tsc(). The only difference
      between vget_cycles() and native_read_tsc() was that
      vget_cycles() returned zero instead of crashing on TSC-less
      systems. KVM already checks vclock_mode() before calling that
      function, so the extra check is unnecessary. Also, KVM
      (host-side) requires the TSC to exist.
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Acked-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Huang Rui <ray.huang@amd.com>
      Cc: John Stultz <john.stultz@linaro.org>
      Cc: Len Brown <lenb@kernel.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: kvm ML <kvm@vger.kernel.org>
      Link: http://lkml.kernel.org/r/20615df14ae2eb713ea7a5f5123c1dc4c7ca993d.1434501121.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      881d7bf8
    • Andy Lutomirski's avatar
      x86/asm/tsc: Inline native_read_tsc() and remove __native_read_tsc() · c6e5ca35
      Andy Lutomirski authored
      In the following commit:
      
        cdc7957d ("x86: move native_read_tsc() offline")
      
      ... native_read_tsc() was moved out of line, presumably for some
      now-obsolete vDSO-related reason. Undo it.
      
      The entire rdtsc, shl, or sequence is only 11 bytes, and calls
      via rdtscl() and similar helpers were already inlined.
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Huang Rui <ray.huang@amd.com>
      Cc: John Stultz <john.stultz@linaro.org>
      Cc: Len Brown <lenb@kernel.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: kvm ML <kvm@vger.kernel.org>
      Link: http://lkml.kernel.org/r/d05ffe2aaf8468ca475ebc00efad7b2fa174af19.1434501121.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      c6e5ca35
    • Denys Vlasenko's avatar
      x86/asm/entry/32: Replace RESTORE_RSI_RDI with open-coded 32-bit reads · c73e36b7
      Denys Vlasenko authored
      This doesn't change much, but uses shorter 32-bit insns:
      
              -48 8b 74 24 68         mov    0x68(%rsp),%rsi
              -48 8b 7c 24 70         mov    0x70(%rsp),%rdi
              -48 8b 54 24 60         mov    0x60(%rsp),%rdx
              +8b 54 24 60            mov    0x60(%rsp),%edx
              +8b 74 24 68            mov    0x68(%rsp),%esi
              +8b 7c 24 70            mov    0x70(%rsp),%edi
      
      and does the loads in pt_regs order.
      
      Since these are the only uses of RESTORE_RSI_RDI[_RDX], drop
      these macros.
      Signed-off-by: default avatarDenys Vlasenko <dvlasenk@redhat.com>
      Cc: Alexei Starovoitov <ast@plumgrid.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Kees Cook <keescook@chromium.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Will Drewry <wad@chromium.org>
      Link: http://lkml.kernel.org/r/1435954742-2545-1-git-send-email-dvlasenk@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      c73e36b7
  2. 05 Jul, 2015 6 commits
    • Linus Torvalds's avatar
      Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · 1c4c7159
      Linus Torvalds authored
      Pull ext4 bugfixes from Ted Ts'o:
       "Bug fixes (all for stable kernels) for ext4:
      
         - address corner cases for indirect blocks->extent migration
      
         - fix reserved block accounting invalidate_page when
           page_size != block_size (i.e., ppc or 1k block size file systems)
      
         - fix deadlocks when a memcg is under heavy memory pressure
      
         - fix fencepost error in lazytime optimization"
      
      * tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
        ext4: replace open coded nofail allocation in ext4_free_blocks()
        ext4: correctly migrate a file with a hole at the beginning
        ext4: be more strict when migrating to non-extent based file
        ext4: fix reservation release on invalidatepage for delalloc fs
        ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp
        bufferhead: Add _gfp version for sb_getblk()
        ext4: fix fencepost error in lazytime optimization
      1c4c7159
    • Linus Torvalds's avatar
      Linux 4.2-rc1 · d770e558
      Linus Torvalds authored
      d770e558
    • Linus Torvalds's avatar
      Merge tag 'platform-drivers-x86-v4.2-2' of... · a585d2b7
      Linus Torvalds authored
      Merge tag 'platform-drivers-x86-v4.2-2' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86
      
      Pull late x86 platform driver updates from Darren Hart:
       "The following came in a bit later and I wanted them to bake in next a
        few more days before submitting, thus the second pull.
      
        A new intel_pmc_ipc driver, a symmetrical allocation and free fix in
        dell-laptop, a couple minor fixes, and some updated documentation in
        the dell-laptop comments.
      
        intel_pmc_ipc:
         - Add Intel Apollo Lake PMC IPC driver
      
        tc1100-wmi:
         - Delete an unnecessary check before the function call "kfree"
      
        dell-laptop:
         - Fix allocating & freeing SMI buffer page
         - Show info about WiGig and UWB in debugfs
         - Update information about wireless control"
      
      * tag 'platform-drivers-x86-v4.2-2' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86:
        intel_pmc_ipc: Add Intel Apollo Lake PMC IPC driver
        tc1100-wmi: Delete an unnecessary check before the function call "kfree"
        dell-laptop: Fix allocating & freeing SMI buffer page
        dell-laptop: Show info about WiGig and UWB in debugfs
        dell-laptop: Update information about wireless control
      a585d2b7
    • Michal Hocko's avatar
      ext4: replace open coded nofail allocation in ext4_free_blocks() · 7444a072
      Michal Hocko authored
      ext4_free_blocks is looping around the allocation request and mimics
      __GFP_NOFAIL behavior without any allocation fallback strategy. Let's
      remove the open coded loop and replace it with __GFP_NOFAIL. Without the
      flag the allocator has no way to find out never-fail requirement and
      cannot help in any way.
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Cc: stable@vger.kernel.org
      7444a072
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 1dc51b82
      Linus Torvalds authored
      Pull more vfs updates from Al Viro:
       "Assorted VFS fixes and related cleanups (IMO the most interesting in
        that part are f_path-related things and Eric's descriptor-related
        stuff).  UFS regression fixes (it got broken last cycle).  9P fixes.
        fs-cache series, DAX patches, Jan's file_remove_suid() work"
      
      [ I'd say this is much more than "fixes and related cleanups".  The
        file_table locking rule change by Eric Dumazet is a rather big and
        fundamental update even if the patch isn't huge.   - Linus ]
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (49 commits)
        9p: cope with bogus responses from server in p9_client_{read,write}
        p9_client_write(): avoid double p9_free_req()
        9p: forgetting to cancel request on interrupted zero-copy RPC
        dax: bdev_direct_access() may sleep
        block: Add support for DAX reads/writes to block devices
        dax: Use copy_from_iter_nocache
        dax: Add block size note to documentation
        fs/file.c: __fget() and dup2() atomicity rules
        fs/file.c: don't acquire files->file_lock in fd_install()
        fs:super:get_anon_bdev: fix race condition could cause dev exceed its upper limitation
        vfs: avoid creation of inode number 0 in get_next_ino
        namei: make set_root_rcu() return void
        make simple_positive() public
        ufs: use dir_pages instead of ufs_dir_pages()
        pagemap.h: move dir_pages() over there
        remove the pointless include of lglock.h
        fs: cleanup slight list_entry abuse
        xfs: Correctly lock inode when removing suid and file capabilities
        fs: Call security_ops->inode_killpriv on truncate
        fs: Provide function telling whether file_remove_privs() will do anything
        ...
      1dc51b82
    • Linus Torvalds's avatar
      bluetooth: fix list handling · 9b284cbd
      Linus Torvalds authored
      Commit 835a6a2f ("Bluetooth: Stop sabotaging list poisoning")
      thought that the code was sabotaging the list poisoning when NULL'ing
      out the list pointers and removed it.
      
      But what was going on was that the bluetooth code was using NULL
      pointers for the list as a way to mark it empty, and that commit just
      broke it (and replaced the test with NULL with a "list_empty()" test on
      a uninitialized list instead, breaking things even further).
      
      So fix it all up to use the regular and real list_empty() handling
      (which does not use NULL, but a pointer to itself), also making sure to
      initialize the list properly (the previous NULL case was initialized
      implicitly by the session being allocated with kzalloc())
      
      This is a combination of patches by Marcel Holtmann and Tedd Ho-Jeong
      An.
      
      [ I would normally expect to get this through the bt tree, but I'm going
        to release -rc1, so I'm just committing this directly   - Linus ]
      Reported-and-tested-by: default avatarJörg Otte <jrg.otte@gmail.com>
      Cc: Alexey Dobriyan <adobriyan@gmail.com>
      Original-by: default avatarTedd Ho-Jeong An <tedd.an@intel.com>
      Original-by: Marcel Holtmann <marcel@holtmann.org>:
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9b284cbd
  3. 04 Jul, 2015 30 commits