linux-kernel - Re: Linux 3.1-rc9

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Message-ID: <CA+55aFyybeTZvzSU4L=hV1Y6+wXn2ZkuZF9R+vAj6MRVC+MmBQ@mail.gmail.com>
Date:	Mon, 24 Oct 2011 09:51:09 +0200
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Simon Kirby <sim@...tway.ca>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Linux 3.1-rc9

On Mon, Oct 24, 2011 at 9:48 AM, Martin Schwidefsky
<schwidefsky@...ibm.com> wrote:
>
> These types are still there because cputime_t can be u32 or u64. E.g. this
>
>  timer->expires.cpu = 0;
>
> will give the following sparse warning
>
>  kernel/posix-cpu-timers.c:463:46: warning: implicit cast to nocast type

Ok, we should probably special-case zero for that case too (we
consider zero to be very special - it's not only the NULL pointer, but
0 is special for the bitwise types etc). So this is very arguably a
sparse issue: casting zero is special.

                  Linus
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