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| author | H. Peter Anvin <hpa@zytor.com> | 2016-06-08 21:38:41 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2016-06-08 21:41:20 +0200 |
| commit | ba741e356c49bfce0adcfa851080666870867f6b (patch) | |
| tree | 8b306da6a492e6b37522eaf7271c5882fffb3c3b /arch | |
| parent | x86, asm: define CC_SET() and CC_OUT() macros (diff) | |
| download | linux-ba741e356c49bfce0adcfa851080666870867f6b.tar.xz linux-ba741e356c49bfce0adcfa851080666870867f6b.zip | |
x86, asm: change GEN_*_RMWcc() to use CC_SET()/CC_OUT()
Change the GEN_*_RMWcc() macros to use the CC_SET()/CC_OUT() macros
defined in <asm/asm.h>, and disable the use of asm goto if
__GCC_ASM_FLAG_OUTPUTS__ is enabled. This allows gcc to receive the
flags output directly in gcc 6+.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/1465414726-197858-6-git-send-email-hpa@linux.intel.com
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/rmwcc.h | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/x86/include/asm/rmwcc.h b/arch/x86/include/asm/rmwcc.h index e3264c414c4a..661dd305694a 100644 --- a/arch/x86/include/asm/rmwcc.h +++ b/arch/x86/include/asm/rmwcc.h @@ -1,7 +1,9 @@ #ifndef _ASM_X86_RMWcc #define _ASM_X86_RMWcc -#ifdef CC_HAVE_ASM_GOTO +#if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CC_HAVE_ASM_GOTO) + +/* Use asm goto */ #define __GEN_RMWcc(fullop, var, cc, ...) \ do { \ @@ -19,13 +21,15 @@ cc_label: \ #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \ __GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val)) -#else /* !CC_HAVE_ASM_GOTO */ +#else /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */ + +/* Use flags output or a set instruction */ #define __GEN_RMWcc(fullop, var, cc, ...) \ do { \ bool c; \ - asm volatile (fullop "; set" #cc " %1" \ - : "+m" (var), "=qm" (c) \ + asm volatile (fullop ";" CC_SET(cc) \ + : "+m" (var), CC_OUT(cc) (c) \ : __VA_ARGS__ : "memory"); \ return c; \ } while (0) @@ -36,6 +40,6 @@ do { \ #define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \ __GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val)) -#endif /* CC_HAVE_ASM_GOTO */ +#endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */ #endif /* _ASM_X86_RMWcc */ |