linux-kernel - Re: [PATCH 1/6] cputime: Fix nsecs_to

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Message-ID: <5318C50D.2010505@redhat.com>
Date:	Thu, 06 Mar 2014 13:57:17 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/6] cputime: Fix nsecs_to_cputime() return type cast

On 03/06/2014 12:56 PM, Frederic Weisbecker wrote:
> Even though nsec based cputime_t maps to u64, nsecs_to_cputime() must
> return a cputime_t value. We want to enforce this kind of cast in order
> to track down buggy manipulations of cputime_t such as direct access
> of its values under wrong assumptions on its backend type (nsecs,
> jiffies, etc...) by core code.
>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

Acked-by: Rik van Riel <riel@...hat.com>

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