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https://github.com/edk2-porting/linux-next.git
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ba741e356c
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>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#ifndef _ASM_X86_RMWcc
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#define _ASM_X86_RMWcc
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#if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CC_HAVE_ASM_GOTO)
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/* Use asm goto */
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#define __GEN_RMWcc(fullop, var, cc, ...) \
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do { \
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asm_volatile_goto (fullop "; j" #cc " %l[cc_label]" \
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: : "m" (var), ## __VA_ARGS__ \
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: "memory" : cc_label); \
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return 0; \
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cc_label: \
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return 1; \
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} while (0)
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#define GEN_UNARY_RMWcc(op, var, arg0, cc) \
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__GEN_RMWcc(op " " arg0, var, cc)
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#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \
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__GEN_RMWcc(op " %1, " arg0, var, cc, vcon (val))
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#else /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */
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/* Use flags output or a set instruction */
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#define __GEN_RMWcc(fullop, var, cc, ...) \
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do { \
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bool c; \
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asm volatile (fullop ";" CC_SET(cc) \
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: "+m" (var), CC_OUT(cc) (c) \
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: __VA_ARGS__ : "memory"); \
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return c; \
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} while (0)
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#define GEN_UNARY_RMWcc(op, var, arg0, cc) \
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__GEN_RMWcc(op " " arg0, var, cc)
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#define GEN_BINARY_RMWcc(op, var, vcon, val, arg0, cc) \
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__GEN_RMWcc(op " %2, " arg0, var, cc, vcon (val))
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#endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CC_HAVE_ASM_GOTO) */
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#endif /* _ASM_X86_RMWcc */
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