linux-kernel - Re: [PATCH -tip 3/3] define nsecs_to

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Message-ID: <1259231226.4273.29.camel@twins>
Date:	Thu, 26 Nov 2009 11:27:06 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Spencer Candland <spencer@...ehost.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Balbir Singh <balbir@...ibm.com>,
	Américo Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH -tip 3/3] define nsecs_to_jiffies()

On Thu, 2009-11-26 at 14:49 +0900, Hidetoshi Seto wrote:
> Use of msecs_to_jiffies() for nsecs_to_cputime() have some problems:
> 
>  - The type of msecs_to_jiffies()'s argument is unsigned int, so
>    it cannot convert msecs greater than UINT_MAX = about 49.7 days.
>  - msecs_to_jiffies() returns MAX_JIFFY_OFFSET if MSB of argument
>    is set, assuming that input was negative value.  So it cannot
>    convert msecs greater than INT_MAX = about 24.8 days too.
> 
> This patch defines a new function nsecs_to_jiffies() that can deal
> greater values, and that can deal all incoming values as unsigned.

This looks good too,

Thanks Hidetoshi-san!
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