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Subject[PATCH] x86: Simplify calls to cpuid by using + for in/out constraints
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
---

Build-tested only.

arch/x86/include/asm/processor.h | 7 +++----
arch/x86/xen/enlighten.c | 7 +++----
2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index c776826..dfa947e 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -180,11 +180,10 @@ static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
{
/* ecx is often an input as well as an output. */
asm("cpuid"
- : "=a" (*eax),
+ : "+a" (*eax),
"=b" (*ebx),
- "=c" (*ecx),
- "=d" (*edx)
- : "0" (*eax), "2" (*ecx));
+ "+c" (*ecx),
+ "=d" (*edx));
}

static inline void load_cr3(pgd_t *pgdir)
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 6ee2ef8..6eab164 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -190,11 +190,10 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
}

asm(XEN_EMULATE_PREFIX "cpuid"
- : "=a" (*ax),
+ : "+a" (*ax),
"=b" (*bx),
- "=c" (*cx),
- "=d" (*dx)
- : "0" (*ax), "2" (*cx));
+ "+c" (*cx),
+ "=d" (*dx));

*cx &= maskecx;
*dx &= maskedx;
--
1.5.6.5


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