linux-kernel - Re: fs hang in 2.6.27.y | Fwd: [Bug 15658] New: [PATCH] x86 constant_test_bit() prone to misoptimization with gcc-4.4

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Date:	Fri, 24 Sep 2010 10:05:16 +0300
From:	Michael Shigorin <mike@...n.org.ua>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Volodymyr G. Lukiianyk" <volodymyrgl@...il.com>,
	Alexander Chumachenko <ledest@...il.com>,
	Glauber de Oliveira Costa <gcosta@...hat.com>
Subject: Re: fs hang in 2.6.27.y | Fwd: [Bug 15658] New: [PATCH] x86 constant_test_bit() prone to misoptimization with gcc-4.4

On Thu, Sep 23, 2010 at 04:50:22PM -0700, Andrew Morton wrote:
> (huge quote)

Andrew, huge THANKS for getting to this!

> Working around a gcc-4.4 bug is a good thing, and the patch
> cleans the code up anyway - is there a reason for casting away
> the `volatile const'?

We'll discuss this; I'm actually no kernel developer (a silly
local iso9660 patch in 1999, nothing more) but rather a proxy.

> We don't have a Signed-off-by: for this patch - it would be
> good to have one, please.  We should at least have yours, as
> you sent the patch.

OK, Greg already told us to do so for stable@ but things were
busy there as well.  We'll fix up.

> Also, we prefer to have real names in kernel commits.
> Does "Led" refer to Alexander Chumachenko?

Yes.

2 led: a signed-off patch, please? :)

-- 
 ---- WBR, Michael Shigorin <mike@...linux.ru>
  ------ Linux.Kiev http://www.linux.kiev.ua/
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