linux-kernel - [PATCH] xen: Use wmb instead of rmb in xen_evtchn_do

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Message-ID: <20080610073532.GG24381%yamahata@valinux.co.jp>
Date:	Tue, 10 Jun 2008 16:35:32 +0900
From:	Isaku Yamahata <yamahata@...inux.co.jp>
To:	jeremy@...p.org
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-ia64-devel@...ts.xensource.com,
	Samuel Thibault <samuel.thibault@...citrix.com>
Subject: [PATCH] xen: Use wmb instead of rmb in xen_evtchn_do_upcall().

This patch is ported one from 534:77db69c38249 of linux-2.6.18-xen.hg.
Use wmb instead of rmb to enforce ordering between
evtchn_upcall_pending and evtchn_pending_sel stores
in xen_evtchn_do_upcall().

Cc: Samuel Thibault <samuel.thibault@...citrix.com>
Signed-off-by: Isaku Yamahata <yamahata@...inux.co.jp>
---
 drivers/xen/events.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 73d78dc..332dd63 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -529,7 +529,7 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
 
 #ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
 		/* Clear master flag /before/ clearing selector flag. */
-		rmb();
+		wmb();
 #endif
 		pending_words = xchg(&vcpu_info->evtchn_pending_sel, 0);
 		while (pending_words != 0) {
-- 
1.5.3
--
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