linux-kernel - Re: [PATCH 1/2] Avoid bio

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Message-ID: <20080624080744.GL20851@kernel.dk>
Date:	Tue, 24 Jun 2008 10:07:44 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Avoid bio_endio recursion

On Tue, Jun 24 2008, Mikulas Patocka wrote:
> Hi
> 
> bio_endio calls bi_end_io callback. In case of stacked devices (raid, dm), 
> bio_end_io may call bio_endio again, up to an unspecified length.
> 
> The crash because of stack overflow was really observed on sparc64. And 
> this recursion was one of the contributing factors (using 9 stack frames 
> --- that is 1728 bytes).

Looks good, I like the concept. Can you please make it a little less
goto driven, though? The next_bio and goto next_bio could just be a
while().

-- 
Jens Axboe

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