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authorVineet Gupta <vgupta@synopsys.com>2015-11-09 17:48:34 +0530
committerVineet Gupta <vgupta@synopsys.com>2015-11-14 13:12:30 +0530
commit1cfc05cbe2c9757c6cc36804df96e3ed28e940a1 (patch)
treec9567d20752208af3678b3276bc3dac72706d0ab /arch
parenta6416f57ce57fb390b6ee30b12c01c29032a26af (diff)
downloadlinux-sh-1cfc05cbe2c9757c6cc36804df96e3ed28e940a1.tar.gz
ARC: cpu_relax() to be compiler barrier even for UP
cpu_relax() on ARC has been barrier only for SMP (and no-op for UP). Per recent discussions, it is safer to make it a compiler barrier unconditionally. Link: http://lkml.kernel.org/r/53A7D3AA.9020100@synopsys.com Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arc/include/asm/processor.h4
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h
index 44545354e9e8..1d694c1ef6d6 100644
--- a/arch/arc/include/asm/processor.h
+++ b/arch/arc/include/asm/processor.h
@@ -57,11 +57,7 @@ struct task_struct;
* A lot of busy-wait loops in SMP are based off of non-volatile data otherwise
* get optimised away by gcc
*/
-#ifdef CONFIG_SMP
#define cpu_relax() __asm__ __volatile__ ("" : : : "memory")
-#else
-#define cpu_relax() do { } while (0)
-#endif
#define cpu_relax_lowlatency() cpu_relax()