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Will Deacon f4e177d126 mm/migrate.c: stabilise page count when migrating transparent hugepages 
When migrating a transparent hugepage, migrate_misplaced_transhuge_page
guards itself against a concurrent fastgup of the page by checking that
the page count is equal to 2 before and after installing the new pmd.

If the page count changes, then the pmd is reverted back to the original
entry, however there is a small window where the new (possibly writable)
pmd is installed and the underlying page could be written by userspace.
Restoring the old pmd could therefore result in loss of data.

This patch fixes the problem by freezing the page count whilst updating
the page tables, which protects against a concurrent fastgup without the
need to restore the old pmd in the failure case (since the page count
can no longer change under our feet).

Link: http://lkml.kernel.org/r/1497349722-6731-4-git-send-email-will.deacon@arm.com
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Steve Capper <steve.capper@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-07-10 16:32:31 -07:00
..
kasan
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-05-10 10:30:46 -07:00
backing-dev.c
bdi: Drop 'parent' argument from bdi_register[_va]()
2017-04-20 12:09:55 -06:00
balloon_compaction.c
mm: balloon: use general non-lru movable page feature
2016-07-26 16:19:19 -07:00
bootmem.c
mm/bootmem.c: cosmetic improvement of code readability
2017-02-22 16:41:29 -08:00
cleancache.c
fs: switch ->s_uuid to uuid_t
2017-06-05 16:59:12 +02:00
cma_debug.c
cma: Store a name in the cma structure
2017-04-18 20:41:12 +02:00
cma.c
mm/cma.c: warn if the CMA area could not be activated
2017-07-10 16:32:31 -07:00
cma.h
cma: Store a name in the cma structure
2017-04-18 20:41:12 +02:00
compaction.c
mm, compaction: skip over holes in __reset_isolation_suitable
2017-07-06 16:24:32 -07:00
debug_page_ref.c
mm/page_ref: add tracepoint to track down page reference manipulation
2016-03-17 15:09:34 -07:00
debug.c
mm, debug: print raw struct page data in __dump_page()
2016-12-12 18:55:08 -08:00
dmapool.c
lib/vsprintf.c: remove %Z support
2017-02-27 18:43:47 -08:00
early_ioremap.c
mm/early_ioremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
fadvise.c
mm: fadvise: avoid expensive remote LRU cache draining after FADV_DONTNEED
2016-12-20 09:48:46 -08:00
failslab.c
mm: fault-inject take over bootstrap kmem_cache check
2016-03-15 16:55:16 -07:00
filemap.c
mm: hugetlb: return immediately for hugetlb page in __delete_from_page_cache()
2017-07-10 16:32:30 -07:00
frame_vector.c
treewide: use kv[mz]alloc* rather than opencoded variants
2017-05-08 17:15:13 -07:00
frontswap.c
mm, frontswap: convert frontswap_enabled to static key
2016-07-26 16:19:19 -07:00
gup.c
mm, gup: ensure real head page is ref-counted when using hugepages
2017-07-06 16:24:34 -07:00
highmem.c
mm/highmem: make nr_free_highpages() handles all highmem zones by itself
2016-05-19 19:12:14 -07:00
huge_memory.c
mm, THP, swap: check whether THP can be split firstly
2017-07-06 16:24:31 -07:00
hugetlb_cgroup.c
mm, hugetlb_cgroup: round limit_in_bytes down to hugepage size
2016-05-20 17:58:30 -07:00
hugetlb.c
mm/hugetlb.c: warn the user when issues arise on boot due to hugepages
2017-07-10 16:32:31 -07:00
hwpoison-inject.c
mm: hwpoison: call shake_page() unconditionally
2017-05-03 15:52:12 -07:00
init-mm.c
mm: Add a user_ns owner to mm_struct and fix ptrace permission checks
2016-11-22 11:49:48 -06:00
internal.h
mm, compaction: finish whole pageblock to reduce fragmentation
2017-05-08 17:15:10 -07:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
powerpc updates for 4.13
2017-07-07 13:55:45 -07:00
Kconfig.debug
mm: enable page poisoning early at boot
2017-05-03 15:52:10 -07:00
khugepaged.c
mm: make PR_SET_THP_DISABLE immediately active
2017-07-10 16:32:31 -07:00
kmemcheck.c
mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU
2017-04-18 11:42:36 -07:00
kmemleak-test.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak.c
mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects
2017-07-06 16:24:34 -07:00
ksm.c
ksm: optimize refile of stable_node_dup at the head of the chain
2017-07-06 16:24:31 -07:00
list_lru.c
mm/list_lru.c: avoid error-path NULL pointer deref
2016-10-27 18:43:42 -07:00
maccess.c
x86: remove more uaccess_32.h complexity
2016-05-22 17:21:27 -07:00
madvise.c
swap: add block io poll in swapin path
2017-07-10 16:32:30 -07:00
Makefile
percpu: expose statistics about percpu memory via debugfs
2017-06-20 15:31:38 -04:00
memblock.c
mm, memory_hotplug: move movable_node to the hotplug proper
2017-07-06 16:24:35 -07:00
memcontrol.c
mm/memcontrol: exclude @root from checks in mem_cgroup_low
2017-07-10 16:32:31 -07:00
memory_hotplug.c
mm/memory_hotplug.c: add NULL check to avoid potential NULL pointer dereference
2017-07-10 16:32:30 -07:00
memory-failure.c
mm: hwpoison: introduce idenfity_page_state
2017-07-10 16:32:30 -07:00
memory.c
mm/memory.c: convert to DEFINE_DEBUGFS_ATTRIBUTE
2017-07-10 16:32:30 -07:00
mempolicy.c
mm, mempolicy: don't check cpuset seqlock where it doesn't matter
2017-07-06 16:24:34 -07:00
mempool.c
sched/wait: Rename wait_queue_t => wait_queue_entry_t
2017-06-20 12:18:27 +02:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
mm/migrate.c: stabilise page count when migrating transparent hugepages
2017-07-10 16:32:31 -07:00
mincore.c
mm: remove shmem_mapping() shmem_zero_setup() duplicates
2017-02-24 17:46:56 -08:00
mlock.c
mlock: fix mlock count can not decrease in race condition
2017-06-02 15:07:38 -07:00
mm_init.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mmap.c
Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm
2017-07-08 12:17:25 -07:00
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_notifier.c
mm: Use static initialization for "srcu"
2017-04-18 11:38:22 -07:00
mmzone.c
mm/mmzone.c: swap likely to unlikely as code logic is different for next_zones_zonelist()
2017-02-22 16:41:29 -08:00
mprotect.c
mm: drop NULL return check of pte_offset_map_lock()
2017-07-06 16:24:33 -07:00
mremap.c
mm: convert generic code to 5-level paging
2017-03-09 11:48:47 -08:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
mm/nobootmem.c: return 0 when start_pfn equals end_pfn
2017-07-06 16:24:31 -07:00
nommu.c
mm, vmalloc: use __GFP_HIGHMEM implicitly
2017-05-08 17:15:13 -07:00
oom_kill.c
mm/oom_kill: count global and memory cgroup oom kills
2017-07-06 16:24:35 -07:00
page_alloc.c
mm, page_alloc: fallback to smallest page when not stealing whole pageblock
2017-07-10 16:32:30 -07:00
page_counter.c
mm: page_counter: let page_counter_try_charge() return bool
2015-11-05 19:34:48 -08:00
page_ext.c
mm: enable page poisoning early at boot
2017-05-03 15:52:10 -07:00
page_idle.c
mm: make rmap_one boolean function
2017-05-03 15:52:10 -07:00
page_io.c
swap: add block io poll in swapin path
2017-07-10 16:32:30 -07:00
page_isolation.c
mm: __first_valid_page skip over offline pages
2017-07-06 16:24:32 -07:00
page_owner.c
mm/page_owner: don't define fields on struct page_ext by hard-coding
2016-10-07 18:46:27 -07:00
page_poison.c
mm: enable page poisoning early at boot
2017-05-03 15:52:10 -07:00
page_vma_mapped.c
mm/hugetlb: add size parameter to huge_pte_offset()
2017-07-06 16:24:34 -07:00
page-writeback.c
Writeback error handling fixes (pile #1)
2017-07-07 18:39:15 -07:00
pagewalk.c
mm/hugetlb: add size parameter to huge_pte_offset()
2017-07-06 16:24:34 -07:00
percpu-internal.h
percpu: fix early calls for spinlock in pcpu_stats
2017-06-21 13:53:52 -04:00
percpu-km.c
percpu: fix static checker warnings in pcpu_destroy_chunk
2017-06-29 11:23:38 -04:00
percpu-stats.c
percpu: expose statistics about percpu memory via debugfs
2017-06-20 15:31:38 -04:00
percpu-vm.c
percpu: fix static checker warnings in pcpu_destroy_chunk
2017-06-29 11:23:38 -04:00
percpu.c
percpu: resolve err may not be initialized in pcpu_alloc
2017-06-21 12:00:45 -04:00
pgtable-generic.c
mm: convert generic code to 5-level paging
2017-03-09 11:48:47 -08:00
process_vm_access.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h>
2017-03-02 08:42:28 +01:00
quicklist.c
fix Christoph's email addresses
2016-03-17 15:09:34 -07:00
readahead.c
mm: don't cap request size based on read-ahead setting
2016-12-12 18:55:08 -08:00
rmap.c
mm: memcontrol: per-lruvec stats infrastructure
2017-07-06 16:24:35 -07:00
rodata_test.c
mm: remove rodata_test_data export, add pr_fmt
2017-05-03 15:52:09 -07:00
shmem.c
mm: make PR_SET_THP_DISABLE immediately active
2017-07-10 16:32:31 -07:00
slab_common.c
mm: allow slab_nomerge to be set at build time
2017-07-06 16:24:31 -07:00
slab.c
mm: memcontrol: account slab stats per lruvec
2017-07-06 16:24:35 -07:00
slab.h
mm: memcontrol: account slab stats per lruvec
2017-07-06 16:24:35 -07:00
slob.c
mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU
2017-04-18 11:42:36 -07:00
slub.c
mm: memcontrol: account slab stats per lruvec
2017-07-06 16:24:35 -07:00
sparse-vmemmap.c
mm: convert generic code to 5-level paging
2017-03-09 11:48:47 -08:00
sparse.c
mm, memory_hotplug: do not associate hotadded memory to zones until online
2017-07-06 16:24:32 -07:00
swap_cgroup.c
mm, THP, swap: delay splitting THP during swap out
2017-07-06 16:24:31 -07:00
swap_slots.c
mm, THP, swap: delay splitting THP during swap out
2017-07-06 16:24:31 -07:00
swap_state.c
swap: add block io poll in swapin path
2017-07-10 16:32:30 -07:00
swap.c
mm: per-cgroup memory reclaim stats
2017-07-06 16:24:35 -07:00
swapfile.c
swap: add block io poll in swapin path
2017-07-10 16:32:30 -07:00
truncate.c
mm: fix data corruption due to stale mmap reads
2017-05-12 15:57:15 -07:00
usercopy.c
mm/usercopy: Drop extra is_vmalloc_or_module() check
2017-04-05 12:30:18 -07:00
userfaultfd.c
mm: convert generic code to 5-level paging
2017-03-09 11:48:47 -08:00
util.c
mm: clarify why we want kmalloc before falling backto vmallock
2017-06-02 15:07:37 -07:00
vmacache.c
sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
vmalloc.c
vmalloc: show lazy-purged vma info in vmallocinfo
2017-07-10 16:32:31 -07:00
vmpressure.c
mm, vmpressure: pass-through notification support
2017-07-10 16:32:31 -07:00
vmscan.c
mm, vmscan: avoid thrashing anon lru when free + file is low
2017-07-10 16:32:30 -07:00
vmstat.c
mm: vmstat: move slab statistics from zone to node counters
2017-07-06 16:24:35 -07:00
workingset.c
mm: memcontrol: per-lruvec stats infrastructure
2017-07-06 16:24:35 -07:00
z3fold.c
z3fold: fix page locking in z3fold_alloc()
2017-04-13 18:24:20 -07:00
zbud.c
mm/zbud.c: use list_last_entry() instead of list_tail_entry()
2016-01-15 11:40:52 -08:00
zpool.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zsmalloc.c
mm/zsmalloc.c: fix -Wunneeded-internal-declaration warning
2017-07-10 16:32:30 -07:00
zswap.c
mm/zswap.c: delete an error message for a failed memory allocation in zswap_dstmem_prepare()
2017-07-06 16:24:35 -07:00