linux-kernel - Re: [RFC,PATCH 14/14] utrace core

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Message-ID: <20091214193132.GA14124@redhat.com>
Date:	Mon, 14 Dec 2009 20:31:32 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Roland McGrath <roland@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ananth Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, utrace-devel@...hat.com
Subject: Re: [RFC,PATCH 14/14] utrace core

On 12/14, Oleg Nesterov wrote:
>
> IOW, we must ensure that if ever clear TIF_NOTIFY_RESUME we must not
> miss ->pending_attach, correct? and for this case we have mb() after
> clear_thread_flag(). Perhaps instead we should add mb__after_clear_bit()
> into arch/ hooks, but this needs a lot of arch-dependent changes.

Cough. And I always read this "rmb" as "mb". Even when I changed
the comment to explain that we need a barrier between clear bit
and read flags, I didn't notice it is in fact rmb...

I guess we need the trivial fix, Roland?

Oleg.

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