atomic_long_dec_and_test() is equivalent to atomic_long_dec() and
atomic_long_read() == 0. Use it to make code more succinct.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/zsmalloc.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 1476289b619f..0b4b23740d78 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1828,13 +1828,12 @@ static void putback_zspage_deferred(struct zs_pool *pool,
static inline void zs_pool_dec_isolated(struct zs_pool *pool)
{
VM_BUG_ON(atomic_long_read(&pool->isolated_pages) <= 0);
- atomic_long_dec(&pool->isolated_pages);
/*
* There's no possibility of racing, since wait_for_isolated_drain()
* checks the isolated count under &class->lock after enqueuing
* on migration_wait.
*/
- if (atomic_long_read(&pool->isolated_pages) == 0 && pool->destroying)
+ if (atomic_long_dec_and_test(&pool->isolated_pages) && pool->destroying)
wake_up_all(&pool->migration_wait);
}
--
2.23.0
