kernel_optimize_test/mm
Nadav Amit 40bc831ab5 hugetlbfs: flush TLBs correctly after huge_pmd_unshare
commit a4a118f2eead1d6c49e00765de89878288d4b890 upstream.

When __unmap_hugepage_range() calls to huge_pmd_unshare() succeed, a TLB
flush is missing.  This TLB flush must be performed before releasing the
i_mmap_rwsem, in order to prevent an unshared PMDs page from being
released and reused before the TLB flush took place.

Arguably, a comprehensive solution would use mmu_gather interface to
batch the TLB flushes and the PMDs page release, however it is not an
easy solution: (1) try_to_unmap_one() and try_to_migrate_one() also call
huge_pmd_unshare() and they cannot use the mmu_gather interface; and (2)
deferring the release of the page reference for the PMDs page until
after i_mmap_rwsem is dropeed can confuse huge_pmd_unshare() into
thinking PMDs are shared when they are not.

Fix __unmap_hugepage_range() by adding the missing TLB flush, and
forcing a flush when unshare is successful.

Fixes: 24669e5847 ("hugetlb: use mmu_gather instead of a temporary linked list for accumulating pages)" # 3.6
Signed-off-by: Nadav Amit <namit@vmware.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-11-26 10:39:21 +01:00
..
kasan kasan: fix incorrect arguments passing in kasan_add_zero_shadow 2021-01-27 11:55:23 +01:00
backing-dev.c
balloon_compaction.c
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c mm, compaction: make fast_isolate_freepages() stay within zone 2021-03-04 11:38:38 +01:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: ensure THP availability via has_transparent_hugepage() 2021-07-14 16:56:13 +02:00
debug.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c mm/filemap: add missing mem_cgroup_uncharge() to __add_to_page_cache_locked() 2021-02-10 09:29:21 +01:00
frame_vector.c
frontswap.c
gup_benchmark.c
gup.c mm/gup: fix try_grab_compound_head() race with split_huge_page() 2021-07-14 16:55:42 +02:00
highmem.c
hmm.c mm/hmm: bypass devmap pte when all pfn requested flags are fulfilled 2021-09-18 13:40:36 +02:00
huge_memory.c mm/userfaultfd: fix uffd-wp special cases for fork() 2021-07-25 14:36:18 +02:00
hugetlb_cgroup.c hugetlb_cgroup: fix imbalanced css_get and css_put pair for shared mappings 2021-03-30 14:31:54 +02:00
hugetlb.c hugetlbfs: flush TLBs correctly after huge_pmd_unshare 2021-11-26 10:39:21 +01:00
hwpoison-inject.c
init-mm.c mm/gup: prevent gup_fast from racing with COW during fork 2020-12-30 11:53:54 +01:00
internal.h mm/thp: fix vma_address() if virtual address below file offset 2021-06-30 08:47:27 -04:00
interval_tree.c
ioremap.c
Kconfig mm/zsmalloc.c: drop ZSMALLOC_PGTABLE_MAPPING 2020-12-06 10:19:07 -08:00
Kconfig.debug
khugepaged.c mm: khugepaged: skip huge page collapse for special files 2021-11-06 14:10:09 +01:00
kmemleak.c
ksm.c ksm: fix potential missing rmap_item for stable_node 2021-05-19 10:13:07 +02:00
list_lru.c mm: list_lru: set shrinker map bit when child nr_items is not zero 2020-12-06 10:19:07 -08:00
maccess.c
madvise.c mm/madvise: replace ptrace attach requirement for process_madvise 2021-03-17 17:06:37 +01:00
Makefile
mapping_dirty_helpers.c
memblock.c memblock: make for_each_mem_range() traverse MEMBLOCK_HOTPLUG regions 2021-07-28 14:35:46 +02:00
memcontrol.c memcg: prohibit unconditional exceeding the limit of dying tasks 2021-11-18 14:04:29 +01:00
memfd.c
memory_hotplug.c mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range() 2021-09-22 12:27:59 +02:00
memory-failure.c mm,hwpoison: return -EBUSY when migration fails 2021-07-19 09:44:56 +02:00
memory.c mm/userfaultfd: fix uffd-wp special cases for fork() 2021-07-25 14:36:18 +02:00
mempolicy.c
mempool.c
memremap.c mm: fix memory_failure() handling of dax-namespace metadata 2021-03-04 11:38:21 +01:00
memtest.c
migrate.c mm, thp: use head page in __migration_entry_wait() 2021-06-30 08:47:26 -04:00
mincore.c
mlock.c
mm_init.c
mmap.c mm/mmap.c: fix mmap return value when vma is merged after call_mmap() 2020-12-06 10:19:07 -08:00
mmu_gather.c
mmu_notifier.c mm/mmu_notifiers: ensure range_end() is paired with range_start() 2021-03-30 14:32:06 +02:00
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c
oom_kill.c mm, oom: do not trigger out_of_memory from the #PF 2021-11-18 14:04:30 +01:00
page_alloc.c mm/page_alloc: speed up the iteration of max_order 2021-09-12 08:58:26 +02:00
page_counter.c
page_ext.c
page_idle.c
page_io.c swap: fix swapfile read/write offset 2021-03-07 12:34:15 +01:00
page_isolation.c
page_owner.c
page_poison.c
page_reporting.c
page_reporting.h
page_vma_mapped.c mm/thp: another PVMW_SYNC fix in page_vma_mapped_walk() 2021-06-30 08:47:29 -04:00
page-writeback.c mm: make wait_on_page_writeback() wait for multiple pending writebacks 2021-01-12 20:18:22 +01:00
pagewalk.c
percpu-internal.h percpu: make pcpu_nr_empty_pop_pages per chunk type 2021-04-14 08:42:03 +02:00
percpu-km.c
percpu-stats.c percpu: make pcpu_nr_empty_pop_pages per chunk type 2021-04-14 08:42:03 +02:00
percpu-vm.c
percpu.c percpu: make pcpu_nr_empty_pop_pages per chunk type 2021-04-14 08:42:03 +02:00
pgalloc-track.h
pgtable-generic.c mm/thp: fix __split_huge_pmd_locked() on shmem migration entry 2021-06-30 08:47:26 -04:00
process_vm_access.c mm/process_vm_access.c: include compat.h 2021-01-19 18:27:21 +01:00
ptdump.c mm: ptdump: fix build failure 2021-04-21 13:00:57 +02:00
readahead.c
rmap.c mm/thp: fix page_address_in_vma() on file THP tails 2021-06-30 08:47:27 -04:00
rodata_test.c
shmem.c Revert "mm/shmem: fix shmem_swapin() race with swapoff" 2021-07-25 14:36:20 +02:00
shuffle.c
shuffle.h
slab_common.c mm/slub: fix redzoning for small allocations 2021-06-23 14:42:54 +02:00
slab.c mm/sl?b.c: remove ctor argument from kmem_cache_flags 2021-05-14 09:50:45 +02:00
slab.h mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag 2021-11-26 10:39:19 +01:00
slob.c
slub.c mm, slub: fix incorrect memcg slab count for bulk free 2021-10-27 09:56:53 +02:00
sparse-vmemmap.c
sparse.c mm/sparse: add the missing sparse_buffer_fini() in error branch 2021-05-14 09:50:45 +02:00
swap_cgroup.c
swap_slots.c
swap_state.c
swap.c
swapfile.c mm/swap: fix pte_same_as_swp() not removing uffd-wp bit when compare 2021-06-23 14:42:53 +02:00
truncate.c mm/thp: unmap_mapping_page() to fix THP truncate_cleanup_page() 2021-06-30 08:47:27 -04:00
usercopy.c
userfaultfd.c
util.c mm: don't allow oversized kvmalloc() calls 2021-10-06 15:56:03 +02:00
vmacache.c
vmalloc.c mm/vmalloc.c: fix potential memory leak 2021-01-19 18:27:21 +01:00
vmpressure.c
vmscan.c mm,vmscan: fix divide by zero in get_scan_count 2021-09-18 13:40:36 +02:00
vmstat.c
workingset.c
z3fold.c mm/z3fold: use release_z3fold_page_locked() to release locked z3fold page 2021-07-14 16:56:51 +02:00
zbud.c
zpool.c
zsmalloc.c mm/zsmalloc.c: close race window between zs_pool_dec_isolated() and zs_unregister_migration() 2021-11-18 14:04:26 +01:00
zswap.c