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: 1a4d76076c ("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
cleancache.c
cma_debug.c
cma.c	mm/cma.c: suppress warning	2015-11-05 19:34:48 -08:00
cma.h
compaction.c	mm, cma: prevent nr_isolated_* counters from going negative	2016-05-11 11:21:14 +02:00
debug-pagealloc.c
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
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
gup.c	mm: introduce VM_LOCKONFAULT	2015-11-05 19:34:48 -08:00
highmem.c
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
init-mm.c
internal.h	mm: use 'unsigned int' for page order	2015-11-06 17:50:42 -08:00
interval_tree.c
Kconfig	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
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
Makefile
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
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
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
mmap.c	mm: fix regression in remap_file_pages() emulation	2016-02-25 12:01:21 -08:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
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
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
page_idle.c
page_io.c
page_isolation.c	mm: fix invalid node in alloc_migrate_target()	2016-04-20 15:41:53 +09:00
page_owner.c
page-writeback.c	writeback: use higher precision calculation in domain_dirty_limits()	2016-07-27 09:47:29 -07:00
pagewalk.c
percpu-km.c
percpu-vm.c
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
swap_state.c
swap.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
swapfile.c
truncate.c
userfaultfd.c
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
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
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