From: Vineet Gupta Date: Mon, 9 Nov 2015 12:18:34 +0000 (+0530) Subject: ARC: cpu_relax() to be compiler barrier even for UP X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=1cfc05cbe2c9757c6cc36804df96e3ed28e940a1;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Vineet Gupta --- 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()