diff options
| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2022-11-22 14:42:58 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-22 19:38:39 -0700 |
| commit | f2d03d89615ef65b5dff3aae6581df0b5fcbaa3b (patch) | |
| tree | 23fafdf5532cad8584ae1b6879279f64cbe2d4eb /lib | |
| parent | d4b2e0d433769cb7c87e4c93dc048733388d1c46 (diff) | |
lru_cache: use atomic operations when accessing lc->flags, always
Or, depending on the way locking is implemented at the call sites,
some updates could be lost (has not been observed).
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20221122134301.69258-2-christoph.boehmwalder@linbit.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/lru_cache.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/lru_cache.c b/lib/lru_cache.c index dc35464216d3..fec899386238 100644 --- a/lib/lru_cache.c +++ b/lib/lru_cache.c @@ -364,7 +364,7 @@ static struct lc_element *__lc_get(struct lru_cache *lc, unsigned int enr, unsig struct lc_element *e; PARANOIA_ENTRY(); - if (lc->flags & LC_STARVING) { + if (test_bit(__LC_STARVING, &lc->flags)) { ++lc->starving; RETURN(NULL); } @@ -417,7 +417,7 @@ static struct lc_element *__lc_get(struct lru_cache *lc, unsigned int enr, unsig * the LRU element, we have to wait ... */ if (!lc_unused_element_available(lc)) { - __set_bit(__LC_STARVING, &lc->flags); + set_bit(__LC_STARVING, &lc->flags); RETURN(NULL); } |