linux-kernel - Re: [PATCH 1/1] backing-dev: refactor wb_congested

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Message-ID: <20200312022948.GH22433@bombadil.infradead.org>
Date:   Wed, 11 Mar 2020 19:29:48 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jules Irenge <jbi.octave@...il.com>, boqun.feng@...il.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] backing-dev: refactor wb_congested_put()

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.