x86, cpufeature: Use new CC_HAVE_ASM_GOTO

... for checking for "asm goto" compiler support. It is more explicit
this way and we cover the cases where distros have backported that
support even to gcc versions < 4.5.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1372437701-13351-1-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 11 insertions, 6 deletions

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 47538a61c91b..d3f5c63078d8 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -366,9 +366,10 @@ extern bool __static_cpu_has_safe(u16 bit);
  */
 static __always_inline __pure bool __static_cpu_has(u16 bit)
 {
-#if __GNUC__ > 4 || __GNUC_MINOR__ >= 5
+#ifdef CC_HAVE_ASM_GOTO
 
 #ifdef CONFIG_X86_DEBUG_STATIC_CPU_HAS
+
                 /*
                  * Catch too early usage of this before alternatives
                  * have run.
@@ -384,6 +385,7 @@ static __always_inline __pure bool __static_cpu_has(u16 bit)
                          ".previous\n"
                          /* skipping size check since replacement size = 0 */
                          : : "i" (X86_FEATURE_ALWAYS) : : t_warn);
+
 #endif
 
                 asm goto("1: jmp %l[t_no]\n"
@@ -406,7 +408,9 @@ static __always_inline __pure bool __static_cpu_has(u16 bit)
                 warn_pre_alternatives();
                 return false;
 #endif
-#else /* GCC_VERSION >= 40500 */
+
+#else /* CC_HAVE_ASM_GOTO */
+
                 u8 flag;
                 /* Open-coded due to __stringify() in ALTERNATIVE() */
                 asm volatile("1: movb $0,%0\n"
@@ -427,7 +431,8 @@ static __always_inline __pure bool __static_cpu_has(u16 bit)
                              ".previous\n"
                              : "=qm" (flag) : "i" (bit));
                 return flag;
-#endif
+
+#endif /* CC_HAVE_ASM_GOTO */
 }
 
 #define static_cpu_has(bit)                                     \
@@ -441,7 +446,7 @@ static __always_inline __pure bool __static_cpu_has(u16 bit)
 
 static __always_inline __pure bool _static_cpu_has_safe(u16 bit)
 {
-#if __GNUC__ > 4 || __GNUC_MINOR__ >= 5
+#ifdef CC_HAVE_ASM_GOTO
 /*
  * We need to spell the jumps to the compiler because, depending on the offset,
  * the replacement jump can be bigger than the original jump, and this we cannot
@@ -475,7 +480,7 @@ static __always_inline __pure bool _static_cpu_has_safe(u16 bit)
                 return false;
         t_dynamic:
                 return __static_cpu_has_safe(bit);
-#else /* GCC_VERSION >= 40500 */
+#else
                 u8 flag;
                 /* Open-coded due to __stringify() in ALTERNATIVE() */
                 asm volatile("1: movb $2,%0\n"
@@ -511,7 +516,7 @@ static __always_inline __pure bool _static_cpu_has_safe(u16 bit)
                              : "=qm" (flag)
                              : "i" (bit), "i" (X86_FEATURE_ALWAYS));
                 return (flag == 2 ? __static_cpu_has_safe(bit) : flag);
-#endif
+#endif /* CC_HAVE_ASM_GOTO */
 }
 
 #define static_cpu_has_safe(bit)                                \