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

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Message-ID: <4856E1F5.2000002@goop.org>
Date:	Mon, 16 Jun 2008 14:58:13 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	the arch/x86 maintainers <x86@...nel.org>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Isaku Yamahata <yamahata@...inux.co.jp>,
	Samuel Thibault <samuel.thibault@...citrix.com>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: [PATCH] xen: Use wmb instead of rmb in xen_evtchn_do_upcall().

From: Isaku Yamahata <yamahata@...inux.co.jp>

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 |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

===================================================================
--- 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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