x86, gcc-4.6: Avoid unused by set variables in rdmsr

Avoids quite a lot of warnings with a gcc 4.6 -Wall build
because this happens in a commonly used header file (apic.h)

Signed-off-by: Andi Kleen <ak@linux.intel.com>
LKML-Reference: <201007202219.o6KMJme6021066@imap1.linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index c5bc4c2..084ef95 100644 (file)
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -148,8 +148,8 @@ static inline unsigned long long native_read_pmc(int counter)
 #define rdmsr(msr, val1, val2)                                 \
 do {                                                           \
        u64 __val = native_read_msr((msr));                     \
-       (val1) = (u32)__val;                                    \
-       (val2) = (u32)(__val >> 32);                            \
+       (void)((val1) = (u32)__val);                            \
+       (void)((val2) = (u32)(__val >> 32));                    \
 } while (0)
 
 static inline void wrmsr(unsigned msr, unsigned low, unsigned high)