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| author | H. Peter Anvin <hpa@zytor.com> | 2016-06-08 21:38:37 +0200 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2016-06-08 21:41:20 +0200 |
| commit | 2823d4da5d8a0c222747b24eceb65f5b30717d02 (patch) | |
| tree | d3c6753cdc372ee320aa6b9b289ff3c81987cbe3 /arch/x86/include/asm/percpu.h | |
| parent | x86/hweight: Get rid of the special calling convention (diff) | |
| download | linux-2823d4da5d8a0c222747b24eceb65f5b30717d02.tar.xz linux-2823d4da5d8a0c222747b24eceb65f5b30717d02.zip | |
x86, bitops: remove use of "sbb" to return CF
Use SETC instead of SBB to return the value of CF from assembly. Using
SETcc enables uniformity with other flags-returning pieces of assembly
code.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/1465414726-197858-2-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/x86/include/asm/percpu.h')
| -rw-r--r-- | arch/x86/include/asm/percpu.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index e0ba66ca68c6..65039e9571db 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -510,9 +510,9 @@ do { \ /* This is not atomic against other CPUs -- CPU preemption needs to be off */ #define x86_test_and_clear_bit_percpu(bit, var) \ ({ \ - int old__; \ - asm volatile("btr %2,"__percpu_arg(1)"\n\tsbbl %0,%0" \ - : "=r" (old__), "+m" (var) \ + unsigned char old__; \ + asm volatile("btr %2,"__percpu_arg(1)"\n\tsetc %0" \ + : "=qm" (old__), "+m" (var) \ : "dIr" (bit)); \ old__; \ }) @@ -532,11 +532,11 @@ static __always_inline int x86_this_cpu_constant_test_bit(unsigned int nr, static inline int x86_this_cpu_variable_test_bit(int nr, const unsigned long __percpu *addr) { - int oldbit; + unsigned char oldbit; asm volatile("bt "__percpu_arg(2)",%1\n\t" - "sbb %0,%0" - : "=r" (oldbit) + "setc %0" + : "=qm" (oldbit) : "m" (*(unsigned long *)addr), "Ir" (nr)); return oldbit; |