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| author | Muchun Song <songmuchun@bytedance.com> | 2021-07-23 15:50:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-23 17:43:28 -0700 |
| commit | e904c2ccf9b5cb356eec754ffea05c08984f6535 (patch) | |
| tree | 14d78b1befffceb469a6781e3c7f93aa3da64965 /mm | |
| parent | af64237461910f4c7365d367291d1c4f20c18769 (diff) | |
| download | lwn-e904c2ccf9b5cb356eec754ffea05c08984f6535.tar.gz lwn-e904c2ccf9b5cb356eec754ffea05c08984f6535.zip | |
mm: mmap_lock: fix disabling preemption directly
Commit 832b50725373 ("mm: mmap_lock: use local locks instead of
disabling preemption") fixed a bug by using local locks.
But commit d01079f3d0c0 ("mm/mmap_lock: remove dead code for
!CONFIG_TRACING configurations") changed those lines back to the
original version.
I guess it was introduced by fixing conflicts.
Link: https://lkml.kernel.org/r/20210720074228.76342-1-songmuchun@bytedance.com
Fixes: d01079f3d0c0 ("mm/mmap_lock: remove dead code for !CONFIG_TRACING configurations")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@ionos.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmap_lock.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/mmap_lock.c b/mm/mmap_lock.c index f5852a058ce0..1854850b4b89 100644 --- a/mm/mmap_lock.c +++ b/mm/mmap_lock.c @@ -156,14 +156,14 @@ static inline void put_memcg_path_buf(void) #define TRACE_MMAP_LOCK_EVENT(type, mm, ...) \ do { \ const char *memcg_path; \ - preempt_disable(); \ + local_lock(&memcg_paths.lock); \ memcg_path = get_mm_memcg_path(mm); \ trace_mmap_lock_##type(mm, \ memcg_path != NULL ? memcg_path : "", \ ##__VA_ARGS__); \ if (likely(memcg_path != NULL)) \ put_memcg_path_buf(); \ - preempt_enable(); \ + local_unlock(&memcg_paths.lock); \ } while (0) #else /* !CONFIG_MEMCG */ |