From 4dc7a0bbeb6882ad665e588e82fabe5bb4645f2f Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Thu, 12 Jan 2006 01:05:27 -0800
Subject: [PATCH] sched: add cacheflush() asm

Add per-arch sched_cacheflush() which is a write-back cacheflush used by
the migration-cost calibration code at bootup time.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 arch/ia64/kernel/setup.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'arch/ia64/kernel')

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index c33305d8e5e..d91c8ff2c0d 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -60,6 +60,7 @@
 #include <asm/smp.h>
 #include <asm/system.h>
 #include <asm/unistd.h>
+#include <asm/system.h>
 
 #if defined(CONFIG_SMP) && (IA64_CPU_SIZE > PAGE_SIZE)
 # error "struct cpuinfo_ia64 too big!"
@@ -870,6 +871,15 @@ cpu_init (void)
 	pm_idle = default_idle;
 }
 
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ */
+void sched_cacheflush(void)
+{
+	ia64_sal_cache_flush(3);
+}
+
 void
 check_bugs (void)
 {
-- 
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