linux-kernel - Re: [PATCH] Illustration of warning explosion silliness

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Message-ID: <451B5587.2050601@garzik.org>
Date:	Thu, 28 Sep 2006 00:54:31 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andrew Morton <akpm@...l.org>
CC:	linux-scsi@...r.kernel.org, Greg KH <greg@...ah.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH] Illustration of warning explosion silliness

Andrew Morton wrote:
> On Wed, 27 Sep 2006 21:36:28 -0700
> Andrew Morton <akpm@...l.org> wrote:
> 
>> device_for_each_child() 
> 
> All that being said, device_for_each_child() is rather broken by design. 
> It walks a list of items applying a function to them and bales out on
> first-error.

Or, like scsi_sysfs.c, it stops when it meets the first match.  Which is 
a common thing to do.


> There's no way in which the caller can know which items have been operated
> on, nor which items have yet to be operated on, nor which item experienced
> the failure.  Any caller which is serious about error recovery presumably
> won't use it, unless the callback function happens to be something which
> makes no state changes.

A simple integer return error doesn't tell you all that information 
either.  The actor must obviously store that additional information 
somewhere, if it cares.

But whatever.  I give up.  I'm going back to working on the libata 
warnings each build spits out (iomap).

	Jeff


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