- 19 May, 2022 17 commits
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Miaohe Lin authored
If p is NULL, __swap_duplicate will already return -EINVAL. So if we reach here, p must be non-NULL. Link: https://lkml.kernel.org/r/20220509131416.17553-8-linmiaohe@huawei.comSigned-off-by:
Miaohe Lin <linmiaohe@huawei.com> Reviewed-by:
David Hildenbrand <david@redhat.com> Reviewed-by:
Oscar Salvador <osalvador@suse.de> Cc: Alistair Popple <apopple@nvidia.com> Cc: David Howells <dhowells@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Naoya Horiguchi <naoya.horiguchi@nec.com> Cc: NeilBrown <neilb@suse.de> Cc: Peter Xu <peterx@redhat.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org>
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Miaohe Lin authored
refill_swap_slots_cache is always called when cache->nr is 0. So remove such buggy and confusing check. Link: https://lkml.kernel.org/r/20220509131416.17553-7-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
If offset exceeds the si->max, print bad swap offset entry to help debug the unexpected case. Link: https://lkml.kernel.org/r/20220509131416.17553-6-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
The return value of free_swap_slot is always 0 and also ignored now. Remove it to clean up the code. Link: https://lkml.kernel.org/r/20220509131416.17553-5-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
Fold __swap_info_get() into its sole caller to make code more clear. Minor readability improvement. Link: https://lkml.kernel.org/r/20220509131416.17553-4-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
Use helper macro __ATTR_RW to define vma_ra_enabled_attr to make code more clear. Minor readability improvement. Link: https://lkml.kernel.org/r/20220509131416.17553-3-linmiaohe@huawei.comSigned-off-by:
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Miaohe Lin authored
Patch series "A few cleanup patches for swap". This series contains a few patches to fix the comment, remove unneeded return value, use some helpers and so on. More details can be found in the respective changelogs. This patch (of 14): Use helper is_swap_pte() to check whether pte is swap entry to make code more clear. Minor readability improvement. Link: https://lkml.kernel.org/r/20220509131416.17553-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20220509131416.17553-2-linmiaohe@huawei.comSigned-off-by:
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Yang Shi authored
The readonly FS THP relies on khugepaged to collapse THP for suitable vmas. But the behavior is inconsistent for "always" mode (https://lore.kernel.org/linux-mm/00f195d4-d039-3cf2-d3a1-a2c88de397a0@suse.cz/). The "always" mode means THP allocation should be tried all the time and khugepaged should try to collapse THP all the time. Of course the allocation and collapse may fail due to other factors and conditions. Currently file THP may not be collapsed by khugepaged even though all the conditions are met. That does break the semantics of "always" mode. So make sure readonly FS vmas are registered to khugepaged to fix the break. Register suitable vmas in common mmap path, that could cover both readonly FS vmas and shmem vmas, so remove the khugepaged calls in shmem.c. Still need to keep the khugepaged call in vma_merge() since vma_merge() is called in a lot of places, for example, madvise, mprotect, etc. Link: https://lkml.kernel.org/r/20220510203222.24246-9-shy828301@gmail.comSigned-off-by:
Yang Shi <shy828301@gmail.com> Reported-by:
Vlastimil Babka <vbabka@suse.cz> Acked-by:
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Yang Shi authored
The khugepaged_enter_vma_merge() actually does as the same thing as the khugepaged_enter() section called by shmem_mmap(), so consolidate them into one helper and rename it to khugepaged_enter_vma(). Link: https://lkml.kernel.org/r/20220510203222.24246-8-shy828301@gmail.comSigned-off-by:
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Yang Shi authored
The hugepage_vma_check() could be reused by khugepaged_enter() and khugepaged_enter_vma_merge(), but it is static in khugepaged.c. Make it non-static and declare it in khugepaged.h. Link: https://lkml.kernel.org/r/20220510203222.24246-7-shy828301@gmail.comSigned-off-by:
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Yang Shi authored
The most callers of khugepaged_enter() don't care about the return value. Only dup_mmap(), anonymous THP page fault and MADV_HUGEPAGE handle the error by returning -ENOMEM. Actually it is not harmful for them to ignore the error case either. It also sounds overkilling to fail fork() and page fault early due to khugepaged_enter() error, and MADV_HUGEPAGE does set VM_HUGEPAGE flag regardless of the error. Link: https://lkml.kernel.org/r/20220510203222.24246-6-shy828301@gmail.comSigned-off-by:
Song Liu <song@kernel.org> Acked-by:
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Yang Shi authored
Since commit a4aeaa06 ("mm: khugepaged: skip huge page collapse for special files"), khugepaged just collapses THP for regular file which is the intended usecase for readonly fs THP. Only show regular file as THP eligible accordingly. And make file_thp_enabled() available for khugepaged too in order to remove duplicate code. Link: https://lkml.kernel.org/r/20220510203222.24246-5-shy828301@gmail.comSigned-off-by:
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Yang Shi authored
The DAX vma may be seen by khugepaged when the mm has other khugepaged suitable vmas. So khugepaged may try to collapse THP for DAX vma, but it will fail due to page sanity check, for example, page is not on LRU. So it is not harmful, but it is definitely pointless to run khugepaged against DAX vma, so skip it in early check. Link: https://lkml.kernel.org/r/20220510203222.24246-4-shy828301@gmail.comSigned-off-by:
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Yang Shi authored
The hugepage_vma_check() called by khugepaged_enter_vma_merge() does check VM_NO_KHUGEPAGED. Remove the check from caller and move the check in hugepage_vma_check() up. More checks may be run for VM_NO_KHUGEPAGED vmas, but MADV_HUGEPAGE is definitely not a hot path, so cleaner code does outweigh. Link: https://lkml.kernel.org/r/20220510203222.24246-3-shy828301@gmail.comSigned-off-by:
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Yang Shi authored
Patch series "Make khugepaged collapse readonly FS THP more consistent", v4. The readonly FS THP relies on khugepaged to collapse THP for suitable vmas. But the behavior is inconsistent for "always" mode (https://lore.kernel.org/linux-mm/00f195d4-d039-3cf2-d3a1-a2c88de397a0@suse.cz/). The "always" mode means THP allocation should be tried all the time and khugepaged should try to collapse THP all the time. Of course the allocation and collapse may fail due to other factors and conditions. Currently file THP may not be collapsed by khugepaged even though all the conditions are met. That does break the semantics of "always" mode. So make sure readonly FS vmas are registered to khugepaged to fix the break. Register suitable vmas in common mmap path, that could cover both readonly FS vmas and shmem vmas, so remove the khugepaged calls in shmem.c. The patch 1-7 are minor bug fixes, clean up and preparation patches. Patch 8 is the real meat. Tested with khugepaged test in selftests and the testcase provided by Vlastimil Babka in https://lore.kernel.org/lkml/df3b5d1c-a36b-2c73-3e27-99e74983de3a@suse.cz/ by commenting out MADV_HUGEPAGE call. This patch (of 8): MMF_VM_HUGEPAGE is set as long as the mm is available for khugepaged by khugepaged_enter(), not only when VM_HUGEPAGE is set on vma. Correct the comment to avoid confusion. Link: https://lkml.kernel.org/r/20220510203222.24246-1-shy828301@gmail.com Link: https://lkml.kernel.org/r/20220510203222.24246-2-shy828301@gmail.comSigned-off-by:
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Tong Tiangen authored
If CONFIG_PGTABLE_LEVELS=2 and CONFIG_ARCH_SUPPORTS_PAGE_TABLE_CHECK=y, then we trigger a compile error: error: implicit declaration of function 'pte_user_accessible_page' Move the definition of page table check helper out of branch CONFIG_PGTABLE_LEVELS > 2 Link: https://lkml.kernel.org/r/20220517074548.2227779-3-tongtiangen@huawei.com Fixes: daf214c14dbe ("arm64/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK") Signed-off-by:
Tong Tiangen <tongtiangen@huawei.com> Acked-by:
Catalin Marinas <catalin.marinas@arm.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Guohanjun <guohanjun@huawei.com> Cc: Xie XiuQi <xiexiuqi@huawei.com> Cc: kernel test robot <lkp@intel.com> Signed-off-by:
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Tong Tiangen authored
Two page table check related issues have been fixed here. 1. Open CONFIG_PAGE_TABLE_CHECK in riscv32, we got a compile error[1]: error: implicit declaration of function 'pud_leaf' Add pud_leaf() definition to incluce/asm-generic/pgtable-nopmd.h to fix this issue. 2. Keep consistent with other pud_xxx() helpers, move pud_user() to pgtable-64.h and add pud_user() to pgtable-nopmd.h. [1]https://lore.kernel.org/linux-mm/202205161811.2nLxmN2O-lkp@intel.com/T/ Link: https://lkml.kernel.org/r/20220517074548.2227779-2-tongtiangen@huawei.com Fixes: 856eed79f8d3 ("riscv/mm: enable ARCH_SUPPORTS_PAGE_TABLE_CHECK") Signed-off-by:
kernel test robot <lkp@intel.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Pasha Tatashin <pasha.tatashin@soleen.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Guohanjun <guohanjun@huawei.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Will Deacon <will@kernel.org> Cc: Xie XiuQi <xiexiuqi@huawei.com> Signed-off-by:
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- 13 May, 2022 23 commits
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Rei Yamamoto authored
At present, pages not in the target zone are added to cc->migratepages list in isolate_migratepages_block(). As a result, pages may migrate between nodes unintentionally. This would be a serious problem for older kernels without commit a984226f ("mm: memcontrol: remove the pgdata parameter of mem_cgroup_page_lruvec"), because it can corrupt the lru list by handling pages in list without holding proper lru_lock. Avoid returning a pfn outside the target zone in the case that it is not aligned with a pageblock boundary. Otherwise isolate_migratepages_block() will handle pages not in the target zone. Link: https://lkml.kernel.org/r/20220511044300.4069-1-yamamoto.rei@jp.fujitsu.com Fixes: 70b44595 ("mm, compaction: use free lists to quickly locate a migration source") Signed-off-by:
Rei Yamamoto <yamamoto.rei@jp.fujitsu.com> Reviewed-by:
Mel Gorman <mgorman@techsingularity.net> Reviewed-by:
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Gautam Menghani authored
Fix the warning - "Enum value 'NR_DAMON_OPS' not described in enum 'damon_ops_id'" generated by the command "make pdfdocs" Link: https://lkml.kernel.org/r/20220508073316.141401-1-gautammenghani201@gmail.comSigned-off-by:
Gautam Menghani <gautammenghani201@gmail.com> Reviewed-by:
SeongJae Park <sj@kernel.org> Signed-off-by:
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Ganesan Rajagopal authored
We run a lot of automated tests when building our software and run into OOM scenarios when the tests run unbounded. v1 memcg exports memcg->watermark as "memory.max_usage_in_bytes" in sysfs. We use this metric to heuristically limit the number of tests that can run in parallel based on per test historical data. This metric is currently not exported for v2 memcg and there is no other easy way of getting this information. getrusage() syscall returns "ru_maxrss" which can be used as an approximation but that's the max RSS of a single child process across all children instead of the aggregated max for all child processes. The only work around is to periodically poll "memory.current" but that's not practical for short-lived one-off cgroups. Hence, expose memcg->watermark as "memory.peak" for v2 memcg. Link: https://lkml.kernel.org/r/20220507050916.GA13577@us192.sjc.aristanetworks.comSigned-off-by:
Ganesan Rajagopal <rganesan@arista.com> Acked-by:
Shakeel Butt <shakeelb@google.com> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Acked-by:
Roman Gushchin <roman.gushchin@linux.dev> Acked-by:
Michal Hocko <mhocko@suse.com> Cc: Roman Gushchin <roman.gushchin@linux.dev> Reviewed-by:
Michal Koutný <mkoutny@suse.com> Signed-off-by:
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Muchun Song authored
We must add hugetlb_free_vmemmap=on (or "off") to the boot cmdline and reboot the server to enable or disable the feature of optimizing vmemmap pages associated with HugeTLB pages. However, rebooting usually takes a long time. So add a sysctl to enable or disable the feature at runtime without rebooting. Why we need this? There are 3 use cases. 1) The feature of minimizing overhead of struct page associated with each HugeTLB is disabled by default without passing "hugetlb_free_vmemmap=on" to the boot cmdline. When we (ByteDance) deliver the servers to the users who want to enable this feature, they have to configure the grub (change boot cmdline) and reboot the servers, whereas rebooting usually takes a long time (we have thousands of servers). It's a very bad experience for the users. So we need a approach to enable this feature after rebooting. This is a use case in our practical environment. 2) Some use cases are that HugeTLB pages are allocated 'on the fly' instead of being pulled from the HugeTLB pool, those workloads would be affected with this feature enabled. Those workloads could be identified by the characteristics of they never explicitly allocating huge pages with 'nr_hugepages' but only set 'nr_overcommit_hugepages' and then let the pages be allocated from the buddy allocator at fault time. We can confirm it is a real use case from the commit 099730d6. For those workloads, the page fault time could be ~2x slower than before. We suspect those users want to disable this feature if the system has enabled this before and they don't think the memory savings benefit is enough to make up for the performance drop. 3) If the workload which wants vmemmap pages to be optimized and the workload which wants to set 'nr_overcommit_hugepages' and does not want the extera overhead at fault time when the overcommitted pages be allocated from the buddy allocator are deployed in the same server. The user could enable this feature and set 'nr_hugepages' and 'nr_overcommit_hugepages', then disable the feature. In this case, the overcommited HugeTLB pages will not encounter the extra overhead at fault time. Link: https://lkml.kernel.org/r/20220512041142.39501-5-songmuchun@bytedance.comSigned-off-by:
Muchun Song <songmuchun@bytedance.com> Reviewed-by:
Mike Kravetz <mike.kravetz@oracle.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Iurii Zaikin <yzaikin@google.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: David Hildenbrand <david@redhat.com> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Signed-off-by:
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Muchun Song authored
Use kstrtobool rather than open coding "on" and "off" parsing in mm/hugetlb_vmemmap.c, which is more powerful to handle all kinds of parameters like 'Yy1Nn0' or [oO][NnFf] for "on" and "off". Link: https://lkml.kernel.org/r/20220512041142.39501-4-songmuchun@bytedance.comSigned-off-by:
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Muchun Song authored
Optimizing HugeTLB vmemmap pages is not compatible with allocating memmap on hot added memory. If "hugetlb_free_vmemmap=on" and memory_hotplug.memmap_on_memory" are both passed on the kernel command line, optimizing hugetlb pages takes precedence. However, the global variable memmap_on_memory will still be set to 1, even though we will not try to allocate memmap on hot added memory. Also introduce mhp_memmap_on_memory() helper to move the definition of "memmap_on_memory" to the scope of CONFIG_MHP_MEMMAP_ON_MEMORY. In the next patch, mhp_memmap_on_memory() will also be exported to be used in hugetlb_vmemmap.c. Link: https://lkml.kernel.org/r/20220512041142.39501-3-songmuchun@bytedance.comSigned-off-by:
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Muchun Song authored
Patch series "add hugetlb_optimize_vmemmap sysctl", v11. This series aims to add hugetlb_optimize_vmemmap sysctl to enable or disable the feature of optimizing vmemmap pages associated with HugeTLB pages. This patch (of 4): If the size of "struct page" is not the power of two but with the feature of minimizing overhead of struct page associated with each HugeTLB is enabled, then the vmemmap pages of HugeTLB will be corrupted after remapping (panic is about to happen in theory). But this only exists when !CONFIG_MEMCG && !CONFIG_SLUB on x86_64. However, it is not a conventional configuration nowadays. So it is not a real word issue, just the result of a code review. But we cannot prevent anyone from configuring that combined configure. This hugetlb_optimize_vmemmap should be disable in this case to fix this issue. Link: https://lkml.kernel.org/r/20220512041142.39501-1-songmuchun@bytedance.com Link: https://lkml.kernel.org/r/20220512041142.39501-2-songmuchun@bytedance.comSigned-off-by:
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Baolin Wang authored
On some architectures (like ARM64), it can support CONT-PTE/PMD size hugetlb, which means it can support not only PMD/PUD size hugetlb: 2M and 1G, but also CONT-PTE/PMD size: 64K and 32M if a 4K page size specified. When unmapping a hugetlb page, we will get the relevant page table entry by huge_pte_offset() only once to nuke it. This is correct for PMD or PUD size hugetlb, since they always contain only one pmd entry or pud entry in the page table. However this is incorrect for CONT-PTE and CONT-PMD size hugetlb, since they can contain several continuous pte or pmd entry with same page table attributes, so we will nuke only one pte or pmd entry for this CONT-PTE/PMD size hugetlb page. And now try_to_unmap() is only passed a hugetlb page in the case where the hugetlb page is poisoned. Which means now we will unmap only one pte entry for a CONT-PTE or CONT-PMD size poisoned hugetlb page, and we can still access other subpages of a CONT-PTE or CONT-PMD size poisoned hugetlb page, which will cause serious issues possibly. So we should change to use huge_ptep_clear_flush() to nuke the hugetlb page table to fix this issue, which already considered CONT-PTE and CONT-PMD size hugetlb. We've already used set_huge_swap_pte_at() to set a poisoned swap entry for a poisoned hugetlb page. Meanwhile adding a VM_BUG_ON() to make sure the passed hugetlb page is poisoned in try_to_unmap(). Link: https://lkml.kernel.org/r/0a2e547238cad5bc153a85c3e9658cb9d55f9cac.1652270205.git.baolin.wang@linux.alibaba.com Link: https://lkml.kernel.org/r/730ea4b6d292f32fb10b7a4e87dad49b0eb30474.1652147571.git.baolin.wang@linux.alibaba.comSigned-off-by:
Baolin Wang <baolin.wang@linux.alibaba.com> Reviewed-by:
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Baolin Wang authored
On some architectures (like ARM64), it can support CONT-PTE/PMD size hugetlb, which means it can support not only PMD/PUD size hugetlb: 2M and 1G, but also CONT-PTE/PMD size: 64K and 32M if a 4K page size specified. When migrating a hugetlb page, we will get the relevant page table entry by huge_pte_offset() only once to nuke it and remap it with a migration pte entry. This is correct for PMD or PUD size hugetlb, since they always contain only one pmd entry or pud entry in the page table. However this is incorrect for CONT-PTE and CONT-PMD size hugetlb, since they can contain several continuous pte or pmd entry with same page table attributes. So we will nuke or remap only one pte or pmd entry for this CONT-PTE/PMD size hugetlb page, which is not expected for hugetlb migration. The problem is we can still continue to modify the subpages' data of a hugetlb page during migrating a hugetlb page, which can cause a serious data consistent issue, since we did not nuke the page table entry and set a migration pte for the subpages of a hugetlb page. To fix this issue, we should change to use huge_ptep_clear_flush() to nuke a hugetlb page table, and remap it with set_huge_pte_at() and set_huge_swap_pte_at() when migrating a hugetlb page, which already considered the CONT-PTE or CONT-PMD size hugetlb. [akpm@linux-foundation.org: fix nommu build] [baolin.wang@linux.alibaba.com: fix build errors for !CONFIG_MMU] Link: https://lkml.kernel.org/r/a4baca670aca637e7198d9ae4543b8873cb224dc.1652270205.git.baolin.wang@linux.alibaba.com Link: https://lkml.kernel.org/r/ea5abf529f0997b5430961012bfda6166c1efc8c.1652147571.git.baolin.wang@linux.alibaba.comSigned-off-by:
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Baolin Wang authored
Patch series "Fix CONT-PTE/PMD size hugetlb issue when unmapping or migrating", v4. presently, migrating a hugetlb page or unmapping a poisoned hugetlb page, we'll use ptep_clear_flush() and set_pte_at() to nuke the page table entry and remap it, and this is incorrect for CONT-PTE or CONT-PMD size hugetlb page, which will cause potential data consistent issue. This patch set will change to use hugetlb related APIs to fix this issue. Note: Mike pointed out the huge_ptep_get() will only return the one specific value, and it would not take into account the dirty or young bits of CONT-PTE/PMDs like the huge_ptep_get_and_clear() [1]. This inconsistent issue is not introduced by this patch set, and this issue will be addressed in another thread [2]. Meanwhile the uffd for hugetlb case [3] pointed out by Gerald also needs another patch to address. [1] https://lore.kernel.org/linux-mm/85bd80b4-b4fd-0d3f-a2e5-149559f2f387@oracle.com/ [2] https://lore.kernel.org/all/cover.1651998586.git.baolin.wang@linux.alibaba.com/ [3] https://lore.kernel.org/linux-mm/20220503120343.6264e126@thinkpad/ This patch (of 3): It is incorrect to use ptep_clear_flush() to nuke a hugetlb page table when unmapping or migrating a hugetlb page, and will change to use huge_ptep_clear_flush() instead in the following patches. So this is a preparation patch, which changes the huge_ptep_clear_flush() to return the original pte to help to nuke a hugetlb page table. [baolin.wang@linux.alibaba.com: fix build in several more architectures] Link: https://lkml.kernel.org/r/0009a4cd-2826-e8be-e671-f050d4f18d5d@linux.alibaba.com [sfr@canb.auug.org.au: fixup] Link: https://lkml.kernel.org/r/20220511181531.7f27a5c1@canb.auug.org.au Link: https://lkml.kernel.org/r/cover.1652270205.git.baolin.wang@linux.alibaba.com Link: https://lkml.kernel.org/r/20f77ddab90baa249bd24504c413189b82acde69.1652270205.git.baolin.wang@linux.alibaba.com Link: https://lkml.kernel.org/r/cover.1652147571.git.baolin.wang@linux.alibaba.com Link: https://lkml.kernel.org/r/dcf065868cce35bceaf138613ad27f17bb7c0c19.1652147571.git.baolin.wang@linux.alibaba.comSigned-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Acked-by:
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Fabio M. De Francesco authored
Extend and rework the "Temporary Virtual Mappings" section of the highmem.rst documentation. Despite the local kmaps were introduced by Thomas Gleixner in October 2020, documentation was still missing information about them. These additions rely largely on Gleixner's patches, Jonathan Corbet's LWN articles, comments by Ira Weiny and Matthew Wilcox, and in-code comments from ./include/linux/highmem.h. 1) Add a paragraph to document kmap_local_page(). 2) Reorder the list of functions by decreasing order of preference of use. 3) Rework part of the kmap() entry in list. Link: https://lkml.kernel.org/r/20220428212455.892-5-fmdefrancesco@gmail.comSigned-off-by:
Fabio M. De Francesco <fmdefrancesco@gmail.com> Suggested-by:
Ira Weiny <ira.weiny@intel.com> Reviewed-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by:
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Fabio M. De Francesco authored
The use of kmap_atomic() is new code is being deprecated in favor of kmap_local_page(). For this reason the "Using kmap_atomic" section in highmem.rst is obsolete and unnecessary, but it can still help developers if it were moved to kdocs in highmem.h. Therefore, move the relevant parts of this section from highmem.rst and merge them with the kdocs in highmem.h. Link: https://lkml.kernel.org/r/20220428212455.892-4-fmdefrancesco@gmail.comSigned-off-by:
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Fabio M. De Francesco authored
kernel-docs that are in include/linux/highmem.h and in include/linux/highmem-internal.h should be included in highmem.rst. Use kdocs directives to include the above-mentioned comments into highmem.rst. Link: https://lkml.kernel.org/r/20220428212455.892-3-fmdefrancesco@gmail.comSigned-off-by:
Mike Rapoport <rppt@linux.ibm.com> Reviewed-by:
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Fabio M. De Francesco authored
Patch series "Extend and reorganize Highmem's documentation", v4. This series has the purpose to extend and reorganize Highmem's documentation. This is a work in progress because some information should still be moved from highmem.rst to highmem.h and highmem-internal.h. Specifically I'm talking about moving the "how to" information to the relevant headers, as it as been suggested by Ira Weiny (Intel). Also, this is a work in progress because some kdocs in highmem.h and highmem-internal.h should be improved. This patch (of 4): `scripts/kernel-doc -v -none include/linux/highmem*` reports the following warnings: include/linux/highmem.h:160: warning: expecting prototype for kunmap_atomic(). Prototype was for nr_free_highpages() instead include/linux/highmem.h:204: warning: No description found for return value of 'alloc_zeroed_user_highpage_movable' include/linux/highmem-internal.h:256: warning: Function parameter or member '__addr' not described in 'kunmap_atomic' include/linux/highmem-internal.h:256: warning: Excess function parameter 'addr' description in 'kunmap_atomic' Fix these warnings by (1) moving the kernel-doc comments from highmem.h to highmem-internal.h (which is the file were the kunmap_atomic() macro is actually defined), (2) extending and merging it with the comment which was already in highmem-internal.h, and (3) using correct parameter names (4) correcting a few technical inaccuracies in comments, and (5) adding a deprecation notice in kunmap_atomic() for consistency with kmap_atomic(). Link: https://lkml.kernel.org/r/20220428212455.892-1-fmdefrancesco@gmail.com Link: https://lkml.kernel.org/r/20220428212455.892-2-fmdefrancesco@gmail.comSigned-off-by:
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zhenwei pi authored
Originally, do num_poisoned_pages_inc() in memory failure routine, use num_poisoned_pages_dec() to rollback the number if filtered/ cancelled. Suggested by Naoya, do num_poisoned_pages_inc() only in action_result(), this make this clear and simple. Link: https://lkml.kernel.org/r/20220509105641.491313-6-pizhenwei@bytedance.comSigned-off-by:
zhenwei pi <pizhenwei@bytedance.com> Acked-by:
Naoya Horiguchi <naoya.horiguchi@nec.com> Signed-off-by:
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zhenwei pi authored
hwpoison filter is enabled by hwpoison-inject module, after removing this module, hwpoison filter still works. What is worse, user can not find the debugfs entries to know this. Disable the hwpoison filter during removing hwpoison-inject module. Link: https://lkml.kernel.org/r/20220509105641.491313-5-pizhenwei@bytedance.comSigned-off-by:
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zhenwei pi authored
hwpoison_filter is missing in the soft offline path, this leads an issue: after enabling the corrupt filter, the user process still has a chance to inject hwpoison fault by madvise(addr, len, MADV_SOFT_OFFLINE) at PFN which is expected to reject. Also do a minor change in comment of memory_failure(). Link: https://lkml.kernel.org/r/20220509105641.491313-4-pizhenwei@bytedance.comSigned-off-by:
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zhenwei pi authored
Don't decrease the number of poisoned pages in page_alloc.c, let the memory-failure.c do inc/dec poisoned pages only. Also simplify unpoison_memory(), only decrease the number of poisoned pages when: - TestClearPageHWPoison() succeed - put_page_back_buddy succeed After decreasing, print necessary log. Finally, remove clear_page_hwpoison() and unpoison_taken_off_page(). Link: https://lkml.kernel.org/r/20220509105641.491313-3-pizhenwei@bytedance.comSigned-off-by:
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zhenwei pi authored
Patch series "memory-failure: fix hwpoison_filter", v2. As well known, the memory failure mechanism handles memory corrupted event, and try to send SIGBUS to the user process which uses this corrupted page. For the virtualization case, QEMU catches SIGBUS and tries to inject MCE into the guest, and the guest handles memory failure again. Thus the guest gets the minimal effect from hardware memory corruption. The further step I'm working on: 1, try to modify code to decrease poisoned pages in a single place (mm/memofy-failure.c: simplify num_poisoned_pages_dec in this series). 2, try to use page_handle_poison() to handle SetPageHWPoison() and num_poisoned_pages_inc() together. It would be best to call num_poisoned_pages_inc() in a single place too. 3, introduce memory failure notifier list in memory-failure.c: notify the corrupted PFN to someone who registers this list. If I can complete [1] and [2] part, [3] will be quite easy(just call notifier list after increasing poisoned page). 4, introduce memory recover VQ for memory balloon device, and registers memory failure notifier list. During the guest kernel handles memory failure, balloon device gets notified by memory failure notifier list, and tells the host to recover the corrupted PFN(GPA) by the new VQ. 5, host side remaps the corrupted page(HVA), and tells the guest side to unpoison the PFN(GPA). Then the guest fixes the corrupted page(GPA) dynamically. This patch (of 5): clear_hwpoisoned_pages() clears HWPoison flag and decreases the number of poisoned pages, this actually works as part of memory failure. Move this function from sparse.c to memory-failure.c, finally there is no CONFIG_MEMORY_FAILURE in sparse.c. Link: https://lkml.kernel.org/r/20220509105641.491313-1-pizhenwei@bytedance.com Link: https://lkml.kernel.org/r/20220509105641.491313-2-pizhenwei@bytedance.comSigned-off-by:
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Eric Dumazet authored
current->comm[] is not a string (no guarantee for a zero byte in it). strlcpy(s1, s2, l) is calling strlen(s2), potentially causing out-of-bound access, as reported by syzbot: detected buffer overflow in __fortify_strlen ------------[ cut here ]------------ kernel BUG at lib/string_helpers.c:980! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 4087 Comm: dhcpcd-run-hooks Not tainted 5.18.0-rc3-syzkaller-01537-g20b87e7c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:fortify_panic+0x18/0x1a lib/string_helpers.c:980 Code: 8c e8 c5 ba e1 fa e9 23 0f bf fa e8 0b 5d 8c f8 eb db 55 48 89 fd e8 e0 49 40 f8 48 89 ee 48 c7 c7 80 f5 26 8a e8 99 09 f1 ff <0f> 0b e8 ca 49 40 f8 48 8b 54 24 18 4c 89 f1 48 c7 c7 00 00 27 8a RSP: 0018:ffffc900000074a8 EFLAGS: 00010286 RAX: 000000000000002c RBX: ffff88801226b728 RCX: 0000000000000000 RDX: ffff8880198e0000 RSI: ffffffff81600458 RDI: fffff52000000e87 RBP: ffffffff89da2aa0 R08: 000000000000002c R09: 0000000000000000 R10: ffffffff815fae2e R11: 0000000000000000 R12: ffff88801226b700 R13: ffff8880198e0830 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5876ad6ff8 CR3: 000000001a48c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: <IRQ> __fortify_strlen include/linux/fortify-string.h:128 [inline] strlcpy include/linux/fortify-string.h:143 [inline] __set_page_owner_handle+0x2b1/0x3e0 mm/page_owner.c:171 __set_page_owner+0x3e/0x50 mm/page_owner.c:190 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8df/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] __kmem_cache_alloc_lru mm/slub.c:3232 [inline] kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3242 dst_alloc+0x146/0x1f0 net/core/dst.c:92 Link: https://lkml.kernel.org/r/20220509145949.265184-1-eric.dumazet@gmail.com Fixes: 865ed6a3 ("mm/page_owner: record task command name") Signed-off-by:
Eric Dumazet <edumazet@google.com> Reported-by:
syzbot <syzkaller@googlegroups.com> Acked-by:
Waiman Long <longman@redhat.com> Acked-by:
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Andrey Konovalov authored
Various readability clean-ups of KASAN Kconfig options. No functional changes. Link: https://lkml.kernel.org/r/c160840dd9e4b1ad5529ecfdb0bba35d9a14d826.1652203271.git.andreyknvl@google.com Link: https://lkml.kernel.org/r/47afaecec29221347bee49f58c258ac1ced3b429.1652123204.git.andreyknvl@google.comSigned-off-by:
Andrey Konovalov <andreyknvl@google.com> Reviewed-by:
Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Signed-off-by:
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Andrey Konovalov authored
Move the "Boot parameters" section in KASAN documentation next to the section that describes KASAN build options. No content changes. Link: https://lkml.kernel.org/r/870628e1293b4f44edf7cbcb92374ff9eb7503d7.1652203271.git.andreyknvl@google.com Link: https://lkml.kernel.org/r/ec9c923f35e7c5312836c4624a7f317dc1ee2c1c.1652123204.git.andreyknvl@google.comSigned-off-by:
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Andrey Konovalov authored
Do assorted clean-ups and improvements to KASAN documentation, including: - Describe each mode in a dedicated paragraph. - Split out a Support section that describes in details which compilers, architectures and memory types each mode requires/supports. - Capitalize the first letter in the names of each KASAN mode. [andreyknvl@google.com: rewording, per Marco] Link: https://lkml.kernel.org/r/896b2d914d6b50d677fd7b38f76967cc705c01ba.1652203271.git.andreyknvl@google.com Link: https://lkml.kernel.org/r/5bd58ebebf066593ce0e1d265d60278b5f5a1874.1652123204.git.andreyknvl@google.comSigned-off-by:
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