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authorIsaku Yamahata <yamahata@valinux.co.jp>2008-06-16 14:58:13 -0700
committerIngo Molnar <mingo@elte.hu>2008-06-20 14:55:10 +0200
commit6673cf63e5d973db5145d1f48b354efcb9fe2a13 (patch)
treeaaaf1b61ff1313d141415127b8d28b873b50a80e
parent688d22e23ab1caacb2c36c615854294b58f2ea47 (diff)
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@eu.citrix.com> Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: the arch/x86 maintainers <x86@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--drivers/xen/events.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 73d78dc9b87..332dd63750a 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) {