linux-kernel - Re: [PATCH] bitops: remove "optimizations"

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Date:	Tue, 29 Apr 2008 18:51:51 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	David Miller <davem@...emloft.net>
cc:	torvalds@...ux-foundation.org, harvey.harrison@...il.com,
	mingo@...e.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bitops: remove "optimizations"

On Tue, 29 Apr 2008, David Miller wrote:
> From: David Miller <davem@...emloft.net>
> Date: Tue, 29 Apr 2008 03:03:32 -0700 (PDT)
> 
> > From: Thomas Gleixner <tglx@...utronix.de>
> > Date: Tue, 29 Apr 2008 12:01:02 +0200 (CEST)
> > 
> > > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > 
> > Acked-by: David S. Miller <davem@...emloft.net>
> 
> Ironically, I just bisected sparc64 bootup failures to the following
> changeset.  It's very late here, and I haven't looked into the
> details, but it seems to wedge in free_area_init_nodes() on a non-NUMA
> system with CONFIG_NUMA disabled.
> 
> Isn't it funny that this optimization not only was useless, but also
> broke things. :-/

The question is, whether it broke things or just unearthed some bug
hidden elsewhere.

Thanks,
	tglx
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