Messages in this thread Patch in this message |  | | Date | Mon, 16 Jun 2008 14:58:13 -0700 | From | Jeremy Fitzhardinge <> | Subject | [PATCH] xen: Use wmb instead of rmb in xen_evtchn_do_upcall(). |
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From: Isaku Yamahata <yamahata@valinux.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@eu.citrix.com> Signed-off-by: Isaku Yamahata <yamahata@valinux.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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