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SubjectRe: 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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