linux-kernel - Re: linux-next: Tree for July 16 (crash on quad core AMD)

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Message-ID: <48814D81.8060001@gmail.com>
Date:	Sat, 19 Jul 2008 11:12:17 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Pierre Ossman <drzeus@...eus.cx>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	scsi <linux-scsi@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-ide <linux-ide@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>, Takashi Iwai <tiwai@...e.de>,
	tino.keitel@....de
Subject: Re: linux-next: Tree for July 16 (crash on quad core AMD)

Pierre Ossman wrote:
>> Well, I don't know how often such usages would be necessary.  If it's a
>> very common ops, you can add a param to the next function but frankly I
>> think it's better to build a inside control structure for that.  There's
>> no need for external buffer, just an inner loop is sufficient.
>>
> 
> I'm not sure how this can be solved by an inner loop. My primary use
> case is:
> 
> 1. Wait for interrupt
> 2. Write n bytes
> 3. goto 1
> 
> n has no guarantee of being aligned to any page boundaries, so state
> needs to be kept between each invokation of writing a chunk of data. I
> doubt I'm alone in this use pattern (in fact, most device drivers using
> PIO should do something similar).

Oh... I see.  How about adding sg_miter_consume(@miter, @bytes)?  If the
function is never called, the whole chunk is assumed to be consumed.  If
the function is called only @bytes are consumed.

-- 
tejun
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