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[Xen-changelog] [linux-2.6.18-xen] [IA64] barrier in xen_rsm_i

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Subject: [Xen-changelog] [linux-2.6.18-xen] [IA64] barrier in xen_rsm_i
From: "Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 19 Dec 2007 05:40:23 -0800
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# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1197907615 25200
# Node ID 76c09a3354a8d7f8fd74cbdc7dbee2a1e152c74e
# Parent  fc406f9e9a0a8115b0b37e8c7fe37b1879c6a713
[IA64] barrier in xen_rsm_i

Force rsm to be visible, preventing possible looping with
virtual psr.i masked.

Signed-off-by: Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>
 include/asm-ia64/xen/privop.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletion(-)

diff -r fc406f9e9a0a -r 76c09a3354a8 include/asm-ia64/xen/privop.h
--- a/include/asm-ia64/xen/privop.h     Fri Dec 14 11:28:40 2007 +0000
+++ b/include/asm-ia64/xen/privop.h     Mon Dec 17 09:06:55 2007 -0700
@@ -229,7 +229,11 @@ extern void xen_set_eflag(unsigned long)
 /* turning off interrupts can be paravirtualized simply by writing
  * to a memory-mapped virtual psr.i bit (implemented as a 16-bit bool) */
-#define xen_rsm_i()    xen_set_virtual_psr_i(0)
+#define xen_rsm_i()                                                    \
+{                                                                      \
+       xen_set_virtual_psr_i(0);                                       \
+       barrier();                                                      \
 /* turning on interrupts is a bit more complicated.. write to the
  * memory-mapped virtual psr.i bit first (to avoid race condition),

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