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

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Message-Id: <20060927220451.05310cf5.akpm@osdl.org>
Date:	Wed, 27 Sep 2006 22:04:51 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Jeff Garzik <jeff@...zik.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

On Thu, 28 Sep 2006 00:54:31 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> 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.

That code is flakey.  Trace through all the called functions, see all the
errors which get ignored.

> 
> > 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.

Yup.

> But whatever.  I give up.

That's the spirit ;)

> I'm going back to working on the libata 
> warnings each build spits out (iomap).

Thanks.
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