linux-kernel - Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

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Message-ID: <BANLkTi=XDYVyveGR6fh73kiOp=A2eH8b7A@mail.gmail.com>
Date:	Wed, 4 May 2011 08:37:33 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Tejun Heo <tj@...nel.org>,
	Pekka Enberg <penberg@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	werner <w.landgraf@...ru>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

On Wed, May 4, 2011 at 8:28 AM, Christoph Lameter <cl@...ux.com> wrote:
>
> There are no memory barriers used. The barrier() here is a compiler hint
> to not keep data across it.

Go back and read my email, please.

The lack of memory barriers is exactly what I worry about.

Look at the initialization path. The "tid" thing is _not_ purely cpu-local.

                      Linus
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