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Tejun Heo 3bb1138e77 percpu: fix synchronization between synchronous map extension and chunk destruction 
commit 6710e594f71ccaad8101bc64321152af7cd9ea28 upstream.

For non-atomic allocations, pcpu_alloc() can try to extend the area
map synchronously after dropping pcpu_lock; however, the extension
wasn't synchronized against chunk destruction and the chunk might get
freed while extension is in progress.

This patch fixes the bug by putting most of non-atomic allocations
under pcpu_alloc_mutex to synchronize against pcpu_balance_work which
is responsible for async chunk management including destruction.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Fixes: 1a4d76076cda ("percpu: implement asynchronous chunk population")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-07-27 09:47:33 -07:00
..
kasan
kasan: fix kmemleak false-positive in kasan_module_alloc()
2015-11-20 16:17:32 -08:00
backing-dev.c
mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress
2016-02-17 12:31:06 -08:00
balloon_compaction.c
virtio_balloon: fix race between migration and ballooning
2016-03-03 15:07:18 -08:00
bootmem.c
bootmem: avoid freeing to bootmem after bootmem is done
2015-09-08 15:35:28 -07:00
cleancache.c
cleancache: remove limit on the number of cleancache enabled filesystems
2015-04-14 16:49:03 -07:00
cma_debug.c
mm/cma_debug: correct size input to bitmap function
2015-07-17 16:39:54 -07:00
cma.c
mm/cma.c: suppress warning
2015-11-05 19:34:48 -08:00
cma.h
mm: cma: mark cma_bitmap_maxno() inline in header
2015-08-14 15:56:32 -07:00
compaction.c
mm, cma: prevent nr_isolated_* counters from going negative
2016-05-11 11:21:14 +02:00
debug-pagealloc.c
mm/debug-pagealloc: make debug-pagealloc boottime configurable
2014-12-13 12:42:48 -08:00
debug.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
dmapool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
early_ioremap.c
mm/early_ioremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
fadvise.c
writeback: implement and use inode_congested()
2015-06-02 08:33:35 -06:00
failslab.c
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
filemap.c
mm, fs: introduce mapping_gfp_constraint()
2015-11-06 17:50:42 -08:00
frame_vector.c
mm: fix docbook comment for get_vaddr_frames()
2015-11-05 19:34:48 -08:00
frontswap.c
frontswap: allow multiple backends
2015-06-24 17:49:45 -07:00
gup.c
mm: introduce VM_LOCKONFAULT
2015-11-05 19:34:48 -08:00
highmem.c
mm/highmem: make kmap cache coloring aware
2014-08-06 18:01:22 -07:00
huge_memory.c
mm/huge_memory: replace VM_NO_THP VM_BUG_ON with actual VMA check
2016-05-04 14:48:49 -07:00
hugetlb_cgroup.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
hugetlb.c
mm/hugetlb.c: fix resv map memory leak for placeholder entries
2015-12-12 10:15:34 -08:00
hwpoison-inject.c
hwpoison: use page_cgroup_ino for filtering by memcg
2015-09-10 13:29:01 -07:00
init-mm.c
…
internal.h
mm: use 'unsigned int' for page order
2015-11-06 17:50:42 -08:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
Kconfig.debug
mm/debug_pagealloc: remove obsolete Kconfig options
2015-01-08 15:10:52 -08:00
kmemcheck.c
mm/slab_common: move kmem_cache definition to internal header
2014-10-09 22:25:50 -04:00
kmemleak-test.c
mm/kmemleak-test.c: use pr_fmt for logging
2014-06-06 16:08:18 -07:00
kmemleak.c
mm/kmemleak.c: remove unneeded initialization of object to NULL
2015-11-05 19:34:48 -08:00
ksm.c
ksm: unstable_tree_search_insert error checking cleanup
2015-11-05 19:34:48 -08:00
list_lru.c
memcg: simplify and inline __mem_cgroup_from_kmem
2015-11-05 19:34:48 -08:00
maccess.c
mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe
2015-11-05 19:34:48 -08:00
madvise.c
mm: madvise allow remove operation for hugetlbfs
2015-09-08 15:35:28 -07:00
Makefile
media updates for v4.3-rc1
2015-09-11 16:42:39 -07:00
memblock.c
mm/memblock: make memblock_remove_range() static
2015-11-05 19:34:48 -08:00
memcontrol.c
memcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_kmem()
2016-06-24 10:18:20 -07:00
memory_hotplug.c
mm/memory_hotplug.c: check for missing sections in test_pages_in_a_zone()
2015-12-29 17:45:49 -08:00
memory-failure.c
mm: soft-offline: check return value in second __get_any_page() call
2016-02-25 12:01:21 -08:00
memory.c
numa: fix /proc/<pid>/numa_maps for THP
2016-05-04 14:48:49 -07:00
mempolicy.c
mm: rename alloc_pages_exact_node() to __alloc_pages_node()
2015-09-08 15:35:28 -07:00
mempool.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
mm: Export migrate_page_move_mapping and migrate_page_copy
2016-07-27 09:47:31 -07:00
mincore.c
mm/mincore: use offset_in_page macro
2015-11-05 19:34:48 -08:00
mlock.c
mm: fix mlock accouting
2016-02-25 12:01:21 -08:00
mm_init.c
mm: meminit: remove mminit_verify_page_links
2015-06-30 19:44:56 -07:00
mmap.c
mm: fix regression in remap_file_pages() emulation
2016-02-25 12:01:21 -08:00
mmu_context.c
…
mmu_notifier.c
mmu-notifier: add clear_young callback
2015-09-10 13:29:01 -07:00
mmzone.c
mm: microoptimize zonelist operations
2015-02-11 17:06:02 -08:00
mprotect.c
userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx
2015-09-04 16:54:41 -07:00
mremap.c
mm/mremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
mm: page_alloc: pass PFN to __free_pages_bootmem
2015-06-30 19:44:55 -07:00
nommu.c
mm/nommu.c: drop unlikely inside BUG_ON()
2015-11-05 19:34:48 -08:00
oom_kill.c
mm/oom_kill.c: avoid attempting to kill init sharing same memory
2015-12-12 10:15:34 -08:00
page_alloc.c
mm: use phys_addr_t for reserve_bootmem_region() arguments
2016-06-07 18:14:35 -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: introduce idle page tracking
2015-09-10 13:29:01 -07:00
page_idle.c
mm: introduce idle page tracking
2015-09-10 13:29:01 -07:00
page_io.c
fs: use helper bio_add_page() instead of open coding on bi_io_vec
2015-08-13 12:32:00 -06:00
page_isolation.c
mm: fix invalid node in alloc_migrate_target()
2016-04-20 15:41:53 +09:00
page_owner.c
mm/page_owner: set correct gfp_mask on page_owner
2015-07-17 16:39:54 -07:00
page-writeback.c
writeback: use higher precision calculation in domain_dirty_limits()
2016-07-27 09:47:29 -07:00
pagewalk.c
mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers
2015-03-25 16:20:30 -07:00
percpu-km.c
percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated
2014-09-02 14:46:05 -04:00
percpu-vm.c
percpu: move region iterations out of pcpu_[de]populate_chunk()
2014-09-02 14:46:02 -04:00
percpu.c
percpu: fix synchronization between synchronous map extension and chunk destruction
2016-07-27 09:47:33 -07:00
pgtable-generic.c
mm,thp: khugepaged: call pte flush at the time of collapse
2016-02-25 12:01:23 -08:00
process_vm_access.c
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-02-25 12:01:16 -08:00
quicklist.c
…
readahead.c
mm, fs: introduce mapping_gfp_constraint()
2015-11-06 17:50:42 -08:00
rmap.c
mm: page migration use migration entry for swapcache too
2015-11-05 19:34:48 -08:00
shmem.c
make sure that freeing shmem fast symlinks is RCU-delayed
2016-03-03 15:07:23 -08:00
slab_common.c
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slab.c
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slab.h
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slob.c
slab/slub: adjust kmem_cache_alloc_bulk API
2015-11-22 11:58:44 -08:00
slub.c
slub: clean up code for kmem cgroup support to kmem_cache_free_bulk
2016-05-04 14:48:49 -07:00
sparse-vmemmap.c
…
sparse.c
…
swap_cgroup.c
mm: page_cgroup: rename file to mm/swap_cgroup.c
2014-12-10 17:41:09 -08:00
swap_state.c
mm: swap: zswap: maybe_preload & refactoring
2015-09-08 15:35:28 -07:00
swap.c
mm: make compound_head() robust
2015-11-06 17:50:42 -08:00
swapfile.c
mm: /proc/pid/smaps:: show proportional swap share of the mapping
2015-09-08 15:35:28 -07:00
truncate.c
memcg: add per cgroup dirty page accounting
2015-06-02 08:33:33 -06:00
userfaultfd.c
userfaultfd: avoid mmap_sem read recursion in mcopy_atomic
2015-09-04 16:54:41 -07:00
util.c
mm/util: use offset_in_page macro
2015-11-05 19:34:48 -08:00
vmacache.c
mm/vmacache: inline vmacache_valid_mm()
2015-11-05 19:34:48 -08:00
vmalloc.c
mm: vmalloc: don't remove inexistent guard hole in remove_vm_area()
2015-11-20 16:17:32 -08:00
vmpressure.c
mm/vmpressure.c: fix race in vmpressure_work_fn()
2014-12-02 17:32:07 -08:00
vmscan.c
mm: vmscan: reclaim highmem zone if buffer_heads is over limit
2016-05-04 14:48:49 -07:00
vmstat.c
vmstat: allocate vmstat_wq before it is used
2016-01-08 23:47:54 -08:00
workingset.c
list_lru: add helpers to isolate items
2015-02-12 18:54:10 -08:00
zbud.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zpool.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zsmalloc.c
zsmalloc: fix zs_can_compact() integer overflow
2016-05-18 17:06:44 -07:00
zswap.c
mm/zswap: provide unique zpool name
2016-05-11 11:21:14 +02:00