Re: [PATCH v6 44/45] mm: shrinker: hold write lock to reparent shrinker nr_deferred

[Muchun Song <muchun.song@xxxxxxxxx>]

> On Sep 11, 2023, at 17:44, Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> wrote:
> 
> For now, reparent_shrinker_deferred() is the only holder of read lock of
> shrinker_rwsem. And it already holds the global cgroup_mutex, so it will
> not be called in parallel.
> 
> Therefore, in order to convert shrinker_rwsem to shrinker_mutex later,
> here we change to hold the write lock of shrinker_rwsem to reparent.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>

Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>

Thanks.