* [PATCH] mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed.
@ 2017-11-21 12:04 Tetsuo Handa
2017-11-21 14:56 ` Michal Hocko
0 siblings, 1 reply; 2+ messages in thread
From: Tetsuo Handa @ 2017-11-21 12:04 UTC (permalink / raw)
To: linux-mm, akpm; +Cc: Tetsuo Handa
There are users calling unregister_shrinker() when register_shrinker()
failed. Add sanity check to unregister_shrinker().
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index c02c850..9e100cc 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -297,6 +297,8 @@ int register_shrinker(struct shrinker *shrinker)
*/
void unregister_shrinker(struct shrinker *shrinker)
{
+ if (!shrinker->nr_deferred)
+ return;
down_write(&shrinker_rwsem);
list_del(&shrinker->list);
up_write(&shrinker_rwsem);
--
1.8.3.1
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed.
2017-11-21 12:04 [PATCH] mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed Tetsuo Handa
@ 2017-11-21 14:56 ` Michal Hocko
0 siblings, 0 replies; 2+ messages in thread
From: Michal Hocko @ 2017-11-21 14:56 UTC (permalink / raw)
To: Tetsuo Handa; +Cc: linux-mm, akpm
On Tue 21-11-17 21:04:13, Tetsuo Handa wrote:
> There are users calling unregister_shrinker() when register_shrinker()
> failed. Add sanity check to unregister_shrinker().
>
> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
> ---
> mm/vmscan.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index c02c850..9e100cc 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -297,6 +297,8 @@ int register_shrinker(struct shrinker *shrinker)
> */
> void unregister_shrinker(struct shrinker *shrinker)
> {
> + if (!shrinker->nr_deferred)
> + return;
make it WARN_ON(), we really want to know about those, because something
is clearly wrong with them.
> down_write(&shrinker_rwsem);
> list_del(&shrinker->list);
> up_write(&shrinker_rwsem);
> --
> 1.8.3.1
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
--
Michal Hocko
SUSE Labs
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2017-11-21 12:04 [PATCH] mm,vmscan: Make unregister_shrinker() no-op if register_shrinker() failed Tetsuo Handa
2017-11-21 14:56 ` Michal Hocko
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