linux-kernel - Re: [PATCH 1/3] signal: sys_rt_sigtimedwait: simplify the timeout logic

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Date:	Mon, 25 Apr 2011 12:38:04 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] signal: sys_rt_sigtimedwait: simplify the timeout logic

On Mon, Apr 25, 2011 at 10:56 AM, Oleg Nesterov <oleg@...hat.com> wrote:
>
> Assuming that timespec_to_jiffies() always returns nonzero if ts is
> "not zero timeout". I think it does.

You really need to double-check that it does. We've not always done
that right, and while I think "round up" is the right thing to do
there, it had better be verified and then a comment added to make sure
it doesn't change.

But yes, with verification and comment, your "if (timeout)  ..
timeout+1" would work fine.

                  Linus
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