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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>
This commit is contained in:
H. Peter Anvin 2016-06-08 12:38:41 -07:00 committed by H. Peter Anvin
parent ff3554b409
commit ba741e356c
1 changed files with 9 additions and 5 deletions
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14
arch/x86/include/asm/rmwcc.h
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@ -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 */