[PATCH] i386: cleanup serialize msr

i386 arch cleanup.  Introduce the serialize macro to serialize processor
state.  Why the microcode update needs it I am not quite sure, since wrmsr()
is already a serializing instruction, but it is a microcode update, so I will
keep the semantic the same, since this could be a timing workaround.  As far
as I can tell, this has always been there since the original microcode update
source.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 10 insertions, 0 deletions

diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index 7e17d3b4f65a..a0489b222702 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -277,6 +277,11 @@ static inline void clear_in_cr4 (unsigned long mask)
         outb((data), 0x23); \
 } while (0)
 
+static inline void serialize_cpu(void)
+{
+         __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+}
+
 static inline void __monitor(const void *eax, unsigned long ecx,
                 unsigned long edx)
 {
diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h
index 85549e656eeb..194160f6a43f 100644
--- a/include/asm-x86_64/processor.h
+++ b/include/asm-x86_64/processor.h
@@ -437,6 +437,11 @@ static inline void prefetchw(void *x)
         outb((data), 0x23); \
 } while (0)
 
+static inline void serialize_cpu(void)
+{
+        __asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
+}
+
 static inline void __monitor(const void *eax, unsigned long ecx,
                 unsigned long edx)
 {