Re: [PATCH v2 0/4] mm/slub: Fix sysfs circular locking dependency

[Qian Cai]

> On Apr 27, 2020, at 7:56 PM, Waiman Long <longman@xxxxxxxxxx> wrote:
> 
> v2:
> - Use regular cmpxchg() instead of x86-only try_cmpxchg() in patch 2.
> - Add patches 3 and 4 to fix circular locking dependency showing up
>   at shutdown time.
> 
> With lockdep enabled, issuing the following command to the slub sysfs
> files will cause splat about circular locking dependency to show up
> either immediately afterwards or at shutdown time.
> 
> # echo 1 > validate
> # echo 1 > shrink
> 
> This patchset fixes these lockdep splats by replacing slab_mutex with
> memcg_cache_ids_sem as well as changing some of the lock operations
> with trylock.

For the whole series, feel free to use,

Tested-by: Qian Cai <cai@xxxxxx>