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| author | Qian Cai <cai@lca.pw> | 2020-08-14 17:31:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-08-14 19:56:56 -0700 |
| commit | 96bdd2bcc1a79818eac6902d6f9565b720f726aa (patch) | |
| tree | 683e25dc89213de50219238277fa8edda1f0ba12 /mm/frontswap.c | |
| parent | 69d0b54d41f915ae45afed6669d34a305cf95ff3 (diff) | |
| download | linux-96bdd2bcc1a79818eac6902d6f9565b720f726aa.tar.gz linux-96bdd2bcc1a79818eac6902d6f9565b720f726aa.tar.bz2 linux-96bdd2bcc1a79818eac6902d6f9565b720f726aa.zip | |
mm/frontswap: mark various intentional data races
There are a few information counters that are intentionally not protected
against increment races, so just annotate them using the data_race()
macro.
BUG: KCSAN: data-race in __frontswap_store / __frontswap_store
write to 0xffffffff8b7174d8 of 8 bytes by task 6396 on cpu 103:
__frontswap_store+0x2d0/0x344
inc_frontswap_failed_stores at mm/frontswap.c:70
(inlined by) __frontswap_store at mm/frontswap.c:280
swap_writepage+0x83/0xf0
pageout+0x33e/0xae0
shrink_page_list+0x1f57/0x2870
shrink_inactive_list+0x316/0x880
shrink_lruvec+0x8dc/0x1380
shrink_node+0x317/0xd80
do_try_to_free_pages+0x1f7/0xa10
try_to_free_pages+0x26c/0x5e0
__alloc_pages_slowpath+0x458/0x1290
__alloc_pages_nodemask+0x3bb/0x450
alloc_pages_vma+0x8a/0x2c0
do_anonymous_page+0x170/0x700
__handle_mm_fault+0xc9f/0xd00
handle_mm_fault+0xfc/0x2f0
do_page_fault+0x263/0x6f9
page_fault+0x34/0x40
read to 0xffffffff8b7174d8 of 8 bytes by task 6405 on cpu 47:
__frontswap_store+0x2b9/0x344
inc_frontswap_failed_stores at mm/frontswap.c:70
(inlined by) __frontswap_store at mm/frontswap.c:280
swap_writepage+0x83/0xf0
pageout+0x33e/0xae0
shrink_page_list+0x1f57/0x2870
shrink_inactive_list+0x316/0x880
shrink_lruvec+0x8dc/0x1380
shrink_node+0x317/0xd80
do_try_to_free_pages+0x1f7/0xa10
try_to_free_pages+0x26c/0x5e0
__alloc_pages_slowpath+0x458/0x1290
__alloc_pages_nodemask+0x3bb/0x450
alloc_pages_vma+0x8a/0x2c0
do_anonymous_page+0x170/0x700
__handle_mm_fault+0xc9f/0xd00
handle_mm_fault+0xfc/0x2f0
do_page_fault+0x263/0x6f9
page_fault+0x34/0x40
Signed-off-by: Qian Cai <cai@lca.pw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Marco Elver <elver@google.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1581114499-5042-1-git-send-email-cai@lca.pw
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/frontswap.c')
| -rw-r--r-- | mm/frontswap.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/mm/frontswap.c b/mm/frontswap.c index 9d977b1fc016..2183a56c7874 100644 --- a/mm/frontswap.c +++ b/mm/frontswap.c @@ -61,16 +61,16 @@ static u64 frontswap_failed_stores; static u64 frontswap_invalidates; static inline void inc_frontswap_loads(void) { - frontswap_loads++; + data_race(frontswap_loads++); } static inline void inc_frontswap_succ_stores(void) { - frontswap_succ_stores++; + data_race(frontswap_succ_stores++); } static inline void inc_frontswap_failed_stores(void) { - frontswap_failed_stores++; + data_race(frontswap_failed_stores++); } static inline void inc_frontswap_invalidates(void) { - frontswap_invalidates++; + data_race(frontswap_invalidates++); } #else static inline void inc_frontswap_loads(void) { } |