linux-kernel - Re: Linux v2.6.21-rc3

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Date:	Wed, 7 Mar 2007 07:39:00 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Greg KH <greg@...ah.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux v2.6.21-rc3

On Wed, 7 Mar 2007, Benjamin Herrenschmidt wrote:
>
> On Tue, 2007-03-06 at 20:59 -0800, Linus Torvalds wrote:
> 
> > Linus Torvalds (2):
> >       Revert "[PATCH] LOG2: Alter get_order() so that it can make use of ilog2() on a constant"
> >       Linux 2.6.21-rc3
> 
> Greg, I think we should revert that patch in 2.6.20.x stable serie too
> as get_order is broken there as well, causing random kernel memory
> corruption every now and then among others.

Did you confirm that that was indeed the cause of the problem you saw?

As far as I can tell, the bug (because it tested the wrong #define) would 
only affect the constant-size case, and only for something larger than a 
single page, and only for a non-power-of-two size. So it looked fairly 
hard to trigger, if only because all the obvious constants I saw seemed 
to already be powers-of-two..

So did you hunt it down to a particular cases where it triggers?

		Linus
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