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Dan Streetman fd5bb66cd9 zswap: don't param_set_charp while holding spinlock 
Change the zpool/compressor param callback function to release the
zswap_pools_lock spinlock before calling param_set_charp, since that
function may sleep when it calls kmalloc with GFP_KERNEL.

While this problem has existed for a while, I wasn't able to trigger it
using a tight loop changing either/both the zpool and compressor params; I
think it's very unlikely to be an issue on the stable kernels, especially
since most zswap users will change the compressor and/or zpool from sysfs
only one time each boot - or zero times, if they add the params to the
kernel boot.

Fixes: c99b42c3529e ("zswap: use charp for zswap param strings")
Link: http://lkml.kernel.org/r/20170126155821.4545-1-ddstreet@ieee.org
Signed-off-by: Dan Streetman <dan.streetman@canonical.com>
Reported-by: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-02-27 18:43:45 -08:00
..
kasan
kasan: drain quarantine of memcg slab objects
2017-02-24 17:46:56 -08:00
backing-dev.c
mm/backing-dev.c: use rb_entry()
2017-02-22 16:41:30 -08:00
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
cleancache: constify cleancache_ops structure
2016-01-27 09:09:57 -05:00
cma_debug.c
mm: cma_alloc: allow to specify GFP mask
2017-02-24 17:46:55 -08:00
cma.c
mm: cma: print allocation failure reason and bitmap status
2017-02-24 17:46:55 -08:00
cma.h
mm: cma: mark cma_bitmap_maxno() inline in header
2015-08-14 15:56:32 -07:00
compaction.c
mm/migration: make isolate_movable_page() return int type
2017-02-24 17:46:55 -08:00
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
mm: cleanups for printing phys_addr_t and dma_addr_t
2017-02-24 17:46:56 -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: do not access page->mapping directly on page_endio
2017-02-24 17:46:56 -08:00
frame_vector.c
mm: replace get_vaddr_frames() write/force parameters with gup_flags
2016-10-19 08:11:24 -07:00
frontswap.c
mm, frontswap: convert frontswap_enabled to static key
2016-07-26 16:19:19 -07:00
gup.c
mm/gup: check for protnone only if it is a PTE entry
2017-02-24 17:46:56 -08:00
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/autonuma: use TNF flag instead of vm fault
2017-02-24 17:46:56 -08:00
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: alloc_contig_range: allow to specify GFP mask
2017-02-24 17:46:55 -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
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, rmap: check all VMAs that PTE-mapped THP can be part of
2017-02-24 17:46:55 -08:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
mm: THP page cache support for ppc64
2016-12-12 18:55:08 -08:00
Kconfig.debug
PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO
2016-09-13 02:35:27 +02:00
khugepaged.c
mm: get rid of __GFP_OTHER_NODE
2017-01-10 18:31:55 -08:00
kmemcheck.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak-test.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak.c
kmemleak: fix reference to Documentation
2016-12-12 18:55:07 -08:00
ksm.c
mm/ksm: handle protnone saved writes when making page write protect
2017-02-24 17:46:56 -08:00
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
mm: remove shmem_mapping() shmem_zero_setup() duplicates
2017-02-24 17:46:56 -08:00
Makefile
mm: introduce page_vma_mapped_walk()
2017-02-24 17:46:55 -08:00
memblock.c
memblock: embed memblock type name within struct memblock_type
2017-02-24 17:46:54 -08:00
memcontrol.c
mm: remove shmem_mapping() shmem_zero_setup() duplicates
2017-02-24 17:46:56 -08:00
memory_hotplug.c
memory-hotplug: use dev_online for memhp_auto_online
2017-02-24 17:46:56 -08:00
memory-failure.c
HWPOISON: soft offlining for non-lru movable page
2017-02-24 17:46:55 -08:00
memory.c
mm/autonuma: let architecture override how the write bit should be stashed in a protnone pte.
2017-02-24 17:46:56 -08:00
mempolicy.c
mm/mempolicy.c: do not put mempolicy before using its nodemask
2017-01-24 16:26:14 -08:00
mempool.c
Revert "mm, mempool: only set __GFP_NOMEMALLOC if there are free elements"
2016-07-28 16:07:41 -07:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
mm: convert remove_migration_pte() to use page_vma_mapped_walk()
2017-02-24 17:46:55 -08:00
mincore.c
mm: remove shmem_mapping() shmem_zero_setup() duplicates
2017-02-24 17:46:56 -08:00
mlock.c
thp: fix corner case of munlock() of PTE-mapped THPs
2016-11-30 16:32:52 -08:00
mm_init.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mmap.c
mm, madvise: fail with ENOMEM when splitting vma will hit max_map_count
2017-02-24 17:46:55 -08:00
mmu_context.c
mm/mmu_context, sched/core: Fix mmu_context.h assumption
2016-04-28 11:44:19 +02:00
mmu_notifier.c
fix Christoph's email addresses
2016-03-17 15:09:34 -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/autonuma: let architecture override how the write bit should be stashed in a protnone pte.
2017-02-24 17:46:56 -08:00
mremap.c
userfaultfd: non-cooperative: add event for memory unmaps
2017-02-24 17:46:55 -08:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping
2016-10-11 15:06:33 -07:00
nommu.c
userfaultfd: non-cooperative: add event for memory unmaps
2017-02-24 17:46:55 -08:00
oom_kill.c
mm, oom: header nodemask is NULL when cpusets are disabled
2017-02-24 17:46:53 -08:00
page_alloc.c
mm/page_alloc.c: remove redundant init code for ZONE_MOVABLE
2017-02-24 17:46:56 -08:00
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/page_ext: support extra space allocation by page_ext user
2016-10-07 18:46:27 -07:00
page_idle.c
mm: fix handling PTE-mapped THPs in page_idle_clear_pte_refs()
2017-02-24 17:46:55 -08:00
page_io.c
writeback: add wbc_to_write_flags()
2016-11-02 10:24:03 -06:00
page_isolation.c
mm, page_alloc: avoid page_to_pfn() when merging buddies
2017-02-22 16:41:27 -08:00
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: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
page_vma_mapped.c
mm: convert page_mapped_in_vma() to use page_vma_mapped_walk()
2017-02-24 17:46:55 -08:00
page-writeback.c
mm/page-writeback.c: place "not" inside of unlikely() statement in wb_domain_writeout_inc()
2017-02-24 17:46:56 -08:00
pagewalk.c
mm, x86: add support for PUD-sized transparent hugepages
2017-02-24 17:46:54 -08:00
percpu-km.c
mm: percpu: use pr_fmt to prefix output
2016-03-17 15:09:34 -07:00
percpu-vm.c
percpu: move region iterations out of pcpu_[de]populate_chunk()
2014-09-02 14:46:02 -04:00
percpu.c
Merge branch 'for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2016-12-13 12:34:47 -08:00
pgtable-generic.c
mm, x86: add support for PUD-sized transparent hugepages
2017-02-24 17:46:54 -08:00
process_vm_access.c
mm: unexport __get_user_pages_unlocked()
2016-12-14 16:04:09 -08:00
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: drop page_check_address{,_transhuge}
2017-02-24 17:46:55 -08:00
shmem.c
mm/shmem.c: fix unlikely() test of info->seals to test only for WRITE and GROW
2017-02-24 17:46:56 -08:00
slab_common.c
kasan: drain quarantine of memcg slab objects
2017-02-24 17:46:56 -08:00
slab.c
slab: introduce __kmemcg_cache_deactivate()
2017-02-22 16:41:27 -08:00
slab.h
slab: remove synchronous synchronize_sched() from memcg cache deactivation path
2017-02-22 16:41:27 -08:00
slob.c
slab: introduce __kmemcg_cache_deactivate()
2017-02-22 16:41:27 -08:00
slub.c
slub: make sysfs directories for memcg sub-caches optional
2017-02-22 16:41:27 -08:00
sparse-vmemmap.c
treewide: replace obsolete _refok by __ref
2016-08-02 17:31:41 -04:00
sparse.c
mm/memory_hotplug: set magic number to page->freelist instead of page->lru.next
2017-02-22 16:41:29 -08:00
swap_cgroup.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
swap_slots.c
mm/swap: skip readahead only when swap slot cache is enabled
2017-02-22 16:41:30 -08:00
swap_state.c
mm/swap: skip readahead only when swap slot cache is enabled
2017-02-22 16:41:30 -08:00
swap.c
mm: vmscan: move dirty pages out of the way until they're flushed
2017-02-24 17:46:54 -08:00
swapfile.c
mm/swap: enable swap slots cache usage
2017-02-22 16:41:30 -08:00
truncate.c
mm: remove shmem_mapping() shmem_zero_setup() duplicates
2017-02-24 17:46:56 -08:00
usercopy.c
mm/usercopy: Switch to using lm_alias
2017-01-11 13:56:50 +00:00
userfaultfd.c
userfaultfd: mcopy_atomic: return -ENOENT when no compatible VMA found
2017-02-24 17:46:55 -08:00
util.c
userfaultfd: non-cooperative: add event for memory unmaps
2017-02-24 17:46:55 -08:00
vmacache.c
mm: unrig VMA cache hit ratio
2016-10-07 18:46:27 -07:00
vmalloc.c
mm: cleanups for printing phys_addr_t and dma_addr_t
2017-02-24 17:46:56 -08:00
vmpressure.c
mm: vmpressure: fix sending wrong events on underflow
2017-02-24 17:46:56 -08:00
vmscan.c
mm, vmscan: clear PGDAT_WRITEBACK when zone is balanced
2017-02-24 17:46:55 -08:00
vmstat.c
mm, compaction: add vmstats for kcompactd work
2017-02-22 16:41:29 -08:00
workingset.c
mm: remove shmem_mapping() shmem_zero_setup() duplicates
2017-02-24 17:46:56 -08:00
z3fold.c
z3fold: add kref refcounting
2017-02-24 17:46:54 -08:00
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: fix comment in zsmalloc
2017-02-24 17:46:56 -08:00
zswap.c
zswap: don't param_set_charp while holding spinlock
2017-02-27 18:43:45 -08:00