linux-kernel - [PATCH v2 0/1] mm: fix the theoretical compound_lock() vs prep_new

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Message-ID: <20140103195519.GA26555@redhat.com>
Date:	Fri, 3 Jan 2014 20:55:19 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: [PATCH v2 0/1] mm: fix the theoretical compound_lock() vs
	prep_new_page() race

On 12/23, Andrea Arcangeli wrote:
>
> Acked-by: Andrea Arcangeli <aarcange@...hat.com>
>
> Only one improvement possible, the smp_wmb() could have been put under
> CONFIG_TRANSPARENT_HUGEPAGE somehow. No difference for x86-64 though.

I thought it would be better to serialize it with get_page_unless_zero()
in general, but OK, As the changelog says I didn't find another problematic
caller, so please see v2. I preserved your ack, thanks.

And I would like to know your opinion about other changes I sent ;)

Oleg.

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