Re: [PATCH 1/1] backing-dev: refactor wb_congested_put()

[Matthew Wilcox]

On Wed, Mar 11, 2020 at 05:59:19PM -0700, Andrew Morton wrote:
> hm, it's hard to get excited over this.  Open-coding the
> refcount_dec_and_lock_irqsave() internals at a callsite in order to
> make sparse happy.
> 
> Is there some other way, using __acquires (for example)?

sparse is really bad at conditional lock acquisition.  we have similar
problems over the vfs.  but we shouldn't be obfuscating our code to make
the tool happy.