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Subject[PATCH] x86: do not expose CONFIG_BSWAP to userspace
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Use ifdef __i486__ to ensure the BSWAP instruction is available
on 32-bit x86.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
HPA,
I'm afraid my knowledge of gcc compiler flags for various models is
lacking, I used i486 as suggested, just wanted to make sure I understood
you corectly.

arch/x86/include/asm/swab.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/swab.h b/arch/x86/include/asm/swab.h
index 306d417..9af180c 100644
--- a/arch/x86/include/asm/swab.h
+++ b/arch/x86/include/asm/swab.h
@@ -7,7 +7,7 @@
static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
{
#ifdef __i386__
-# ifdef CONFIG_X86_BSWAP
+# ifdef __i486__
asm("bswap %0" : "=r" (val) : "0" (val));
# else
asm("xchgb %b0,%h0\n\t" /* swap lower bytes */
@@ -37,7 +37,7 @@ static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
__u64 u;
} v;
v.u = val;
-# ifdef CONFIG_X86_BSWAP
+# ifdef __i486__
asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
: "=r" (v.s.a), "=r" (v.s.b)
: "0" (v.s.a), "1" (v.s.b));
--
1.6.1.401.gf39d5




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