[PATCH] Optimize D-cache alias handling on fork

Virtually index, physically tagged cache architectures can get away
without cache flushing when forking.  This patch adds a new cache
flushing function flush_cache_dup_mm(struct mm_struct *) which for the
moment I've implemented to do the same thing on all architectures
except on MIPS where it's a no-op.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/asm-h8300/cacheflush.h b/include/asm-h8300/cacheflush.h
index 1e4d95bb5ec9..71210d141b64 100644
--- a/include/asm-h8300/cacheflush.h
+++ b/include/asm-h8300/cacheflush.h
@@ -12,6 +12,7 @@
 
 #define flush_cache_all()
 #define flush_cache_mm(mm)
+#define flush_cache_dup_mm(mm)          do { } while (0)
 #define flush_cache_range(vma,a,b)
 #define flush_cache_page(vma,p,pfn)
 #define flush_dcache_page(page)