linux-kernel - Re: [PATCH] locking: type cleanup when accessing fast_read

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Message-ID: <20150520174431.GB6831@redhat.com>
Date:	Wed, 20 May 2015 19:44:31 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Nicholas Mc Guire <der.herr@...r.at>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Nicholas Mc Guire <hofrat@...dl.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] locking: type cleanup when accessing fast_read_ctr

On 05/19, Nicholas Mc Guire wrote:
>
> I assumed it would not matter but did not see a simple way of getting it
> type clean with unsigned either mainly due to the atomic_t being int and
> val in update_fast_ctr() being passed as -1.

Perhaps clear_fast_ctr() should have a comment to explain why it returns
"int"... even if "unsigned" should work too.

Please see https://lkml.org/lkml/2012/11/2/346

Oleg.

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