linux-kernel - Re: [Xen-devel] [PATCH 3/8] x86/xen/p2m: Replace ACCESS_ONCE with READ

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Message-ID: <54B799DC.1050008@citrix.com>
Date:	Thu, 15 Jan 2015 10:43:40 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>,
	<linux-kernel@...r.kernel.org>
CC:	<linux-arch@...r.kernel.org>, <kvm@...r.kernel.org>,
	<x86@...nel.org>, <kvm-ppc@...r.kernel.org>, <linux-mm@...ck.org>,
	<xen-devel@...ts.xenproject.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [Xen-devel] [PATCH 3/8] x86/xen/p2m: Replace ACCESS_ONCE with
 READ_ONCE

On 15/01/15 08:58, Christian Borntraeger wrote:
> ACCESS_ONCE does not work reliably on non-scalar types. For
> example gcc 4.6 and 4.7 might remove the volatile tag for such
> accesses during the SRA (scalar replacement of aggregates) step
> (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145)
> 
> Change the p2m code to replace ACCESS_ONCE with READ_ONCE.

Acked-by: David Vrabel <david.vrabel@...rix.com>

Let me know if you want me to merge this via the Xen tree.

David
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