Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=46d075...
Commit: 46d075be585eae2b74265e4e64ca38dde16a09c6
Parent: a4e22f02f5b6518c1484faea1f88d81802b9feac
Author: Nick Piggin <npiggin@suse.de>
AuthorDate: Tue Nov 11 17:50:48 2008 +0000
Committer: Paul Mackerras <paulus@samba.org>
CommitDate: Wed Nov 19 16:04:55 2008 +1100
powerpc: Optimise smp_wmb
Change 2d1b2027626d5151fff8ef7c06ca8e7876a1a510 ("powerpc: Fixup
lwsync at runtime") removed __SUBARCH_HAS_LWSYNC, causing smp_wmb to
revert back to eieio for all CPUs. This restores the behaviour
intorduced in 74f0609526afddd88bef40b651da24f3167b10b2 ("powerpc:
Optimise smp_wmb on 64-bit processors").
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---
arch/powerpc/include/asm/synch.h | 4 ++++
arch/powerpc/include/asm/system.h | 4 ++--
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/synch.h b/arch/powerpc/include/asm/synch.h
index 45963e8..28f6ddb 100644
--- a/arch/powerpc/include/asm/synch.h
+++ b/arch/powerpc/include/asm/synch.h
@@ -5,6 +5,10 @@
#include <linux/stringify.h>
#include <asm/feature-fixups.h>
+#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,
diff --git a/arch/powerpc/include/asm/system.h b/arch/powerpc/include/asm/system.h
index d6648c1..917f515 100644
--- a/arch/powerpc/include/asm/system.h
+++ b/arch/powerpc/include/asm/system.h
@@ -45,14 +45,14 @@
#ifdef CONFIG_SMP
#ifdef __SUBARCH_HAS_LWSYNC
-# define SMPWMB lwsync
+# define SMPWMB LWSYNC
#else
# define SMPWMB eieio
#endif
#define smp_mb() mb()
#define smp_rmb() rmb()
-#define smp_wmb() __asm__ __volatile__ (__stringify(SMPWMB) : : :"memory")
+#define smp_wmb() __asm__ __volatile__ (stringify_in_c(SMPWMB) : : :"memory")
#define smp_read_barrier_depends() read_barrier_depends()
#else
#define smp_mb() barrier()
--
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