[Linux-cachefs] [PATCH 2/4] fscache: Fix race in fscache_op_complete() due to split atomic_sub & read

[Andrea Parri]

On Wed, Oct 17, 2018 at 04:32:13PM +0100, David Howells wrote:
> Andrea Parri <andrea.parri at amarulasolutions.com> wrote:
> 
> > > Fix this by using atomic_sub_return() instead of two calls.
> > 
> > Seems a case for atomic_sub_return_relaxed()... why not?
> 
> Ummm...  In that case, should it be atomic_sub_return_release()?

Hard to tell for me: your diff./changelog is all I know about fs-cache
... (and this suggests -no-, given that atomic_sub() and atomic_read()
provide no ordering...); good question though. ;-)

  Andrea


> 
> David