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| author | Isaku Yamahata <yamahata@valinux.co.jp> | 2008-06-16 14:58:13 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-20 14:55:10 +0200 |
| commit | 6673cf63e5d973db5145d1f48b354efcb9fe2a13 (patch) | |
| tree | aaaf1b61ff1313d141415127b8d28b873b50a80e | |
| parent | 688d22e23ab1caacb2c36c615854294b58f2ea47 (diff) | |
| download | linux-6673cf63e5d973db5145d1f48b354efcb9fe2a13.tar.bz2 | |
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.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 73d78dc9b875..332dd63750a0 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) { |