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Date: Tue, 11 Mar 2003 14:44:48 -0800
From: Andrew Morton <akpm@digeo.com>
To: george anzinger <george@mvista.com>
Cc: torvalds@transmeta.com, felipe_alfaro@linuxmail.org, cobra@compuserve.com,
       linux-kernel@vger.kernel.org
Subject: Re: Runaway cron task on 2.5.63/4 bk?
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george anzinger <george@mvista.com> wrote:
>
> Ok, here is what I have.  I changed nano sleep to use a local 64-bit 
> value for the target expire time in jiffies.  As much as MAX-INT/2-1 
> will be put in the timer at any one time. It loops till the target 
> time is met or exceeded.  The changes affect (clock)nanosleep only and 
> not timers (they still error out for large values).
> 
> Issues:  The conversion of timespec to jiffies_64 is most easily done 
> by the asm mpy instruction, which results in the required 64 bit 
> result, but C doesn't want to do this sort of thing.

gcc will generate 64bit * 64bit multiplies without resorting to
any library code and you can probably do the division with do_div().


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