Comments in file include/linux/shrinker.h says that
`count_objects` of `struct shrinker` should return SHRINK_EMPTY
when there are no objects to free.
> If there are no objects to free, it should return SHRINK_EMPTY,
> while 0 is returned in cases of the number of freeable items cannot
> be determined or shrinker should skip this cache for this time
> (e.g., their number is below shrinkable limit).
Signed-off-by: Chen Linxuan <chenlinx...@uniontech.com>
---
fs/erofs/zutil.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/erofs/zutil.c b/fs/erofs/zutil.c
index 0dd65cefce33..682863fa9e1c 100644
--- a/fs/erofs/zutil.c
+++ b/fs/erofs/zutil.c
@@ -243,7 +243,9 @@ void erofs_shrinker_unregister(struct super_block *sb)
static unsigned long erofs_shrink_count(struct shrinker *shrink,
struct shrink_control *sc)
{
- return atomic_long_read(&erofs_global_shrink_cnt);
+ unsigned long count = atomic_long_read(&erofs_global_shrink_cnt);
+
+ return count ? count : SHRINK_EMPTY;
}
static unsigned long erofs_shrink_scan(struct shrinker *shrink,
--
2.43.0
