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Chris Down b3a7822e5e mm, memcg: prevent mem_cgroup_protected store tearing 
The read side of this is all protected, but we can still tear if multiple
iterations of mem_cgroup_protected are going at the same time.

There's some intentional racing in mem_cgroup_protected which is ok, but
load/store tearing should be avoided.

Signed-off-by: Chris Down <chris@chrisdown.name>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/d1e9fbc0379fe8db475d82c8b6fbe048876e12ae.1584034301.git.chris@chrisdown.name
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-02 09:35:29 -07:00
..
kasan
RISC-V Patches for the 5.6 Merge Window, Part 1
2020-01-31 11:23:29 -08:00
backing-dev.c
memcg: fix a crash in wb_workfn when a device disappears
2020-01-31 10:30:36 -08:00
balloon_compaction.c
mm/balloon_compaction: suppress allocation warnings
2019-09-04 07:42:01 -04:00
cleancache.c
Driver Core and debugfs changes for 5.3-rc1
2019-07-12 12:24:03 -07:00
cma_debug.c
mm/cma_debug.c: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
cma.c
mm/cma.c: switch to bitmap_zalloc() for cma bitmap allocation
2019-12-01 12:59:09 -08:00
cma.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compaction.c
mm, compaction: fix wrong pfn handling in __reset_isolation_pfn()
2019-10-14 15:04:01 -07:00
debug_page_ref.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug.c
mm: dump_page(): additional diagnostics for huge pinned pages
2020-04-02 09:35:27 -07:00
dmapool.c
mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options
2019-07-12 11:05:46 -07:00
early_ioremap.c
mm/early_ioremap.c: use %pa to print resource_size_t variables
2020-01-31 10:30:38 -08:00
fadvise.c
fs: Export generic_fadvise()
2019-08-30 22:43:58 -07:00
failslab.c
mm/failslab.c: by default, do not fail allocations with direct reclaim only
2019-07-12 11:05:43 -07:00
filemap.c
mm/filemap.c: rewrite pagecache_get_page documentation
2020-04-02 09:35:27 -07:00
frame_vector.c
mm: untag user pointers in get_vaddr_frames
2019-09-25 17:51:41 -07:00
frontswap.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482
2019-06-19 17:09:52 +02:00
gup_benchmark.c
mm/gup_benchmark: support pin_user_pages() and related calls
2020-04-02 09:35:27 -07:00
gup.c
mm/gup: fix omission of check on FOLL_LONGTERM in gup fast path
2020-04-02 09:35:27 -07:00
highmem.c
mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions
2019-12-10 10:12:55 +01:00
hmm.c
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
huge_memory.c
mm/gup: track FOLL_PIN pages
2020-04-02 09:35:27 -07:00
hugetlb_cgroup.c
hugetlb_cgroup: fix illegal access to memory
2020-03-29 09:47:05 -07:00
hugetlb.c
mm/gup: page->hpage_pinned_refcount: exact pin counts for huge pages
2020-04-02 09:35:27 -07:00
hwpoison-inject.c
mm/hwpoison-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
init-mm.c
mm/init-mm.c: include <linux/mman.h> for vm_committed_as_batch
2019-10-19 06:32:32 -04:00
internal.h
mm: swap: make page_evictable() inline
2020-04-02 09:35:27 -07:00
interval_tree.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248
2019-06-19 17:09:08 +02:00
Kconfig
mm/Kconfig: fix trivial help text punctuation
2019-12-01 12:59:10 -08:00
Kconfig.debug
mm: add generic ptdump
2020-02-04 03:05:25 +00:00
khugepaged.c
mm/thp: flush file for !is_shmem PageDirty() case in collapse_file()
2019-12-01 12:59:09 -08:00
kmemleak-test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
kmemleak.c
mm/kmemleak.c: use address-of operator on section symbols
2020-04-02 09:35:26 -07:00
ksm.c
* PPC secure guest support
2019-12-04 11:08:30 -08:00
list_lru.c
mm: memcg/slab: use mem_cgroup_from_obj()
2020-04-02 09:35:28 -07:00
maccess.c
uaccess: Add strict non-pagefault kernel-space read function
2019-11-02 12:39:12 -07:00
madvise.c
mm: do not allow MADV_PAGEOUT for CoW pages
2020-03-21 18:56:06 -07:00
Makefile
mm/Makefile: disable KCSAN for kmemleak
2020-04-02 09:35:26 -07:00
mapping_dirty_helpers.c
mm: Add write-protect and clean utilities for address space ranges
2019-11-06 13:03:36 +01:00
memblock.c
memblock: Use __func__ in remaining memblock_dbg() call sites
2020-01-31 10:30:38 -08:00
memcontrol.c
mm, memcg: prevent mem_cgroup_protected store tearing
2020-04-02 09:35:29 -07:00
memfd.c
mm: page cache: store only head pages in i_pages
2019-09-24 15:54:08 -07:00
memory_hotplug.c
mm, hotplug: fix page online with DEBUG_PAGEALLOC compiled but not enabled
2020-03-06 07:06:09 -06:00
memory-failure.c
mm/memory-failure.c: use page_shift() in add_to_kill()
2019-12-01 12:59:04 -08:00
memory.c
mm: avoid data corruption on CoW fault into PFN-mapped VMA
2020-03-06 07:06:09 -06:00
mempolicy.c
mm/mempolicy.c: fix out of bounds write in mpol_parse_str()
2020-01-31 10:30:36 -08:00
mempool.c
docs/core-api/mm: fix return value descriptions in mm/
2019-03-05 21:07:20 -08:00
memremap.c
mm/memory_hotplug: poison memmap in remove_pfn_range_from_zone()
2020-02-04 03:05:23 +00:00
memtest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
migrate.c
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
mincore.c
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
mlock.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
mm_init.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
mmap.c
mm: Avoid creating virtual address aliases in brk()/mmap()/mremap()
2020-02-20 10:03:14 +00:00
mmu_context.c
sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
mmu_gather.c
asm-generic/tlb: provide MMU_GATHER_TABLE_FREE
2020-02-04 03:05:26 +00:00
mmu_notifier.c
mm/mmu_notifier: silence PROVE_RCU_LIST warnings
2020-03-21 18:56:06 -07:00
mmzone.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mprotect.c
mm, numa: fix bad pmd by atomically check for pmd_trans_huge when marking page tables prot_numa
2020-03-06 07:06:09 -06:00
mremap.c
mm/mremap: Add comment explaining the untagging behaviour of mremap()
2020-03-26 11:28:57 +00:00
msync.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
nommu.c
x86/mm: split vmalloc_sync_all()
2020-03-21 18:56:06 -07:00
oom_kill.c
mm, oom: dump stack of victim when reaping failed
2020-01-31 10:30:38 -08:00
page_alloc.c
mm: kmem: rename memcg_kmem_(un)charge() into memcg_kmem_(un)charge_page()
2020-04-02 09:35:28 -07:00
page_counter.c
mm, memcg: prevent memory.min load/store tearing
2020-04-02 09:35:29 -07:00
page_ext.c
mm, page_owner: fix off-by-one error in __set_page_owner_handle()
2019-10-14 15:04:00 -07:00
page_idle.c
mm/page_idle.c: fix oops because end_pfn is larger than max_pfn
2019-06-29 16:43:45 +08:00
page_io.c
fs: Enable bmap() function to properly return errors
2020-02-03 08:05:37 -05:00
page_isolation.c
mm/page_isolation: fix potential warning from user
2020-01-31 10:30:39 -08:00
page_owner.c
mm/page_owner: don't access uninitialized memmaps when reading /proc/pagetypeinfo
2019-10-19 06:32:31 -04:00
page_poison.c
mm/page_poison.c: fix a typo in a comment
2019-09-24 15:54:08 -07:00
page_vma_mapped.c
mm/page_vma_mapped.c: explicitly compare pfn for normal, hugetlbfs and THP page
2020-01-31 10:30:38 -08:00
page-writeback.c
mm/gup/writeback: add callbacks for inaccessible pages
2020-04-02 09:35:27 -07:00
pagewalk.c
x86: mm: avoid allocating struct mm_struct on the stack
2020-02-04 03:05:25 +00:00
percpu-internal.h
percpu: convert chunk hints to be based on pcpu_block_md
2019-03-13 12:25:31 -07:00
percpu-km.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu-stats.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu-vm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu.c
bitmap: genericize percpu bitmap region iterators
2020-01-20 16:40:56 +01:00
pgtable-generic.c
asm-generic/mm: stub out p{4,u}d_clear_bad() if __PAGETABLE_P{4,U}D_FOLDED
2019-12-01 06:29:19 -08:00
process_vm_access.c
mm, tree-wide: rename put_user_page*() to unpin_user_page*()
2020-01-31 10:30:38 -08:00
ptdump.c
x86: mm: avoid allocating struct mm_struct on the stack
2020-02-04 03:05:25 +00:00
readahead.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
rmap.c
mm/gup: page->hpage_pinned_refcount: exact pin counts for huge pages
2020-04-02 09:35:27 -07:00
rodata_test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
2019-06-05 17:37:17 +02:00
shmem.c
tmpfs: deny and force are not huge mount options
2020-02-18 15:07:30 -05:00
shuffle.c
mm: fix -Wmissing-prototypes warnings
2019-10-07 15:47:19 -07:00
shuffle.h
mm: maintain randomization of page free lists
2019-05-14 19:52:48 -07:00
slab_common.c
mm, memcg: fix build error around the usage of kmem_caches
2020-04-02 09:35:28 -07:00
slab.c
mm, debug_pagealloc: don't rely on static keys too early
2020-01-13 18:19:02 -08:00
slab.h
mm: kmem: rename (__)memcg_kmem_(un)charge_memcg() to __memcg_kmem_(un)charge()
2020-04-02 09:35:28 -07:00
slob.c
mm, sl[aou]b: guarantee natural alignment for kmalloc(power-of-two)
2019-10-07 15:47:20 -07:00
slub.c
slub: relocate freelist pointer to middle of object
2020-04-02 09:35:26 -07:00
sparse-vmemmap.c
mm/sparsemem: convert kmalloc_section_memmap() to populate_section_memmap()
2019-07-18 17:08:07 -07:00
sparse.c
mm/sparse: fix kernel crash with pfn_section_valid check
2020-03-29 09:47:06 -07:00
swap_cgroup.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swap_slots.c
mm/swap_slots.c: assign|reset cache slot by value directly
2020-04-02 09:35:27 -07:00
swap_state.c
mm/swap_state.c: use the same way to count page in [add_to|delete_from]_swap_cache
2020-04-02 09:35:28 -07:00
swap.c
mm: swap: use smp_mb__after_atomic() to order LRU bit set
2020-04-02 09:35:28 -07:00
swapfile.c
mm/swapfile: fix data races in try_to_unuse()
2020-04-02 09:35:27 -07:00
truncate.c
mm/thp: allow dropping THP from page cache
2019-10-19 06:32:33 -04:00
usercopy.c
usercopy: Avoid HIGHMEM pfn warning
2019-09-17 15:20:17 -07:00
userfaultfd.c
mm: fix typos in comments when calling __SetPageUptodate()
2019-12-01 12:59:10 -08:00
util.c
mm/mmap.c: rb_parent is not necessary in __vma_link_list()
2019-12-01 06:29:19 -08:00
vmacache.c
mm: get rid of vmacache_flush_all() entirely
2018-09-13 15:18:04 -10:00
vmalloc.c
x86/mm: split vmalloc_sync_all()
2020-03-21 18:56:06 -07:00
vmpressure.c
mm/vmpressure.c: fix a signedness bug in vmpressure_register_event()
2019-10-07 15:47:19 -07:00
vmscan.c
mm: swap: make page_evictable() inline
2020-04-02 09:35:27 -07:00
vmstat.c
mm/gup: /proc/vmstat: pin_user_pages (FOLL_PIN) reporting
2020-04-02 09:35:27 -07:00
workingset.c
mm: vmscan: detect file thrashing at the reclaim root
2019-12-01 12:59:07 -08:00
z3fold.c
mm/z3fold.c: do not include rwlock.h directly
2020-03-06 07:06:09 -06:00
zbud.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
zpool.c
zpool: add malloc_support_movable to zpool_driver
2019-09-24 15:54:12 -07:00
zsmalloc.c
mm/zsmalloc.c: fix the migrated zspage statistics.
2020-01-04 13:55:09 -08:00
zswap.c
zswap: potential NULL dereference on error in init_zswap()
2020-01-31 10:30:39 -08:00