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| author | Isaku Yamahata <yamahata@valinux.co.jp> | 2008-06-16 23:58:13 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-20 14:56:30 +0200 |
| commit | 46539383791a0e59a4af7412056dfbfc5240af0a (patch) | |
| tree | 3d41133619858b27d3c34e09d787a6120b3646cb /drivers/xen | |
| parent | x86: fix NULL pointer deref in __switch_to (diff) | |
| download | linux-46539383791a0e59a4af7412056dfbfc5240af0a.tar.xz linux-46539383791a0e59a4af7412056dfbfc5240af0a.zip | |
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>
Diffstat (limited to 'drivers/xen')
| -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 4f0f22b020ea..76e5b7386af9 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) { |