[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>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/asm-sparc/system.h b/include/asm-sparc/system.h
index 1f6b71f9e1b6..52fe2e464e15 100644
--- a/include/asm-sparc/system.h
+++ b/include/asm-sparc/system.h
@@ -166,6 +166,16 @@ extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
         } while(0)
 
 /*
+ * 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.
+ *
+ * TODO: fill this in!
+ */
+static inline void sched_cacheflush(void)
+{
+}
+
+/*
  * Changing the IRQ level on the Sparc.
  */
 extern void local_irq_restore(unsigned long);