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Subject[PATCH] x86/asm: Make objtool unreachable macros independent from GCC version
Date
The ASM_UNREACHABLE macro isn't GCC version-specific, so move it outside
the GCC 4.5+ check. Otherwise the 0-day robot will report objtool
warnings for uses of ASM_UNREACHABLE with GCC 4.4.

Also move the annotate_unreachable() macro so the related macros can
stay together.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Fixes: aa5d1b81500e ("x86/asm: Add ASM_UNREACHABLE")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
include/linux/compiler-gcc.h | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 09428df81873..2a34493e4d04 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -128,6 +128,22 @@
#define __always_unused __attribute__((unused))
#define __mode(x) __attribute__((mode(x)))

+#ifdef CONFIG_STACK_VALIDATION
+#define annotate_unreachable() ({ \
+ asm("%c0:\n\t" \
+ ".pushsection .discard.unreachable\n\t" \
+ ".long %c0b - .\n\t" \
+ ".popsection\n\t" : : "i" (__LINE__)); \
+})
+#define ASM_UNREACHABLE \
+ "999:\n\t" \
+ ".pushsection .discard.unreachable\n\t" \
+ ".long 999b - .\n\t" \
+ ".popsection\n\t"
+#else
+#define annotate_unreachable()
+#endif
+
/* gcc version specific checks */

#if GCC_VERSION < 30200
@@ -203,22 +219,6 @@
#endif
#endif

-#ifdef CONFIG_STACK_VALIDATION
-#define annotate_unreachable() ({ \
- asm("%c0:\n\t" \
- ".pushsection .discard.unreachable\n\t" \
- ".long %c0b - .\n\t" \
- ".popsection\n\t" : : "i" (__LINE__)); \
-})
-#define ASM_UNREACHABLE \
- "999:\n\t" \
- ".pushsection .discard.unreachable\n\t" \
- ".long 999b - .\n\t" \
- ".popsection\n\t"
-#else
-#define annotate_unreachable()
-#endif
-
/*
* Mark a position in code as unreachable. This can be used to
* suppress control flow warnings after asm blocks that transfer
--
2.13.3
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