linux-kernel - Re: [PATCH TRIVIAL] mm: Fix build warning in kmem_cache

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Date:	Mon, 30 Jul 2012 19:07:20 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	shuah.khan@...com, cl@...ux.com, glommer@...allels.com,
	js1304@...il.com, shuahkhan@...il.com, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH TRIVIAL] mm: Fix build warning in kmem_cache_create()

On Mon, 30 Jul 2012, Pekka Enberg wrote:

> > -Wunused-label is overridden in gcc for a label that is conditionally
> > referenced by using __maybe_unused in the kernel.  I'm not sure what's so
> > obscure about
> >
> > out: __maybe_unused
> >
> > Are label attributes really that obsecure?
> 
> I think they are.
> 
> The real problem, however, is that label attributes would just paper
> over the badly thought out control flow in the function and not make the
> code any better or easier to read.
> 

So much for compromise, I thought we had agreed that at least some of the 
checks for !name, in_interrupt() or bad size values should be moved out 
from under the #ifdef CONFIG_DEBUG_VM, but this wasn't done.  This 
discussion would be irrelevent if we actually did what we talked about.
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