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/[email protected] Acked-by: Peter Zijlstra <[email protected]> Signed-off-by: Vineet Gupta <[email protected]>
kyagi · Nov 14, 2015 · 1cfc05c · 1cfc05c
1 parent a6416f5
commit 1cfc05c
Showing 1 changed file with 0 additions and 4 deletions.
diff --git 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()