From 3df05fcf89114e9011b899dcb7437a50a978bac1 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Thu, 22 Mar 2018 20:41:46 +1000 Subject: [PATCH] powerpc/64: Fix smp_wmb barrier definition use use lwsync consistently commit 0bfdf598900fd62869659f360d3387ed80eb71cf upstream. asm/barrier.h is not always included after asm/synch.h, which meant it was missing __SUBARCH_HAS_LWSYNC, so in some files smp_wmb() would be eieio when it should be lwsync. kernel/time/hrtimer.c is one case. __SUBARCH_HAS_LWSYNC is only used in one place, so just fold it in to where it's used. Previously with my small simulator config, 377 instances of eieio in the tree. After this patch there are 55. Fixes: 46d075be585e ("powerpc: Optimise smp_wmb") Cc: stable@vger.kernel.org # v2.6.29+ Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/include/asm/barrier.h | 3 ++- arch/powerpc/include/asm/synch.h | 4 ---- 2 files changed, 2 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h index 10daa1d56e0a..c7c63959ba91 100644 --- a/arch/powerpc/include/asm/barrier.h +++ b/arch/powerpc/include/asm/barrier.h @@ -35,7 +35,8 @@ #define rmb() __asm__ __volatile__ ("sync" : : : "memory") #define wmb() __asm__ __volatile__ ("sync" : : : "memory") -#ifdef __SUBARCH_HAS_LWSYNC +/* The sub-arch has lwsync */ +#if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC) # define SMPWMB LWSYNC #else # define SMPWMB eieio diff --git a/arch/powerpc/include/asm/synch.h b/arch/powerpc/include/asm/synch.h index 63e7f5a1f105..6ec546090ba1 100644 --- a/arch/powerpc/include/asm/synch.h +++ b/arch/powerpc/include/asm/synch.h @@ -6,10 +6,6 @@ #include #include -#if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC) -#define __SUBARCH_HAS_LWSYNC -#endif - #ifndef __ASSEMBLY__ extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup; extern void do_lwsync_fixups(unsigned long value, void *fixup_start, -- 2.20.1