linux-kernel - Re: [PATCH 7/7] Fix the case of jiffies wrapping in mm/pdflush.c

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Date:	Tue, 01 Jul 2008 13:05:18 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] Fix the case of jiffies wrapping in mm/pdflush.c

Andrew Morton <akpm@...ux-foundation.org> writes:

>> @@ -151,7 +151,7 @@ static int __pdflush(struct pdflush_work
>>  		if (nr_pdflush_threads <= MIN_PDFLUSH_THREADS)
>>  			continue;
>>  		pdf = list_entry(pdflush_list.prev, struct pdflush_work, list);
>> -		if (jiffies - pdf->when_i_went_to_sleep > 1 * HZ) {
>> +		if (time_after(jiffies, pdf->when_i_went_to_sleep + 1 * HZ)) {
>>  			/* Limit exit rate */
>>  			pdf->when_i_went_to_sleep = jiffies;
>>  			break;					/* exeunt */
>
> I don't think this actually "fixes" anything, does it?  The old code
> should be correct at runtime.

Um.. Yes. It seems I tested something wrong.

> I renamed the patch to "pdflush: use time_after() instead of open-coding it".

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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