[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, 2 insertions, 0 deletions

diff --git a/include/asm-m68k/cacheflush.h b/include/asm-m68k/cacheflush.h
index 24d3ff449135..16bf375fdbe1 100644
--- a/include/asm-m68k/cacheflush.h
+++ b/include/asm-m68k/cacheflush.h
@@ -89,6 +89,8 @@ static inline void flush_cache_mm(struct mm_struct *mm)
                 __flush_cache_030();
 }
 
+#define flush_cache_dup_mm(mm)                  flush_cache_mm(mm)
+
 /* flush_cache_range/flush_cache_page must be macros to avoid
    a dependency on linux/mm.h, which includes this file... */
 static inline void flush_cache_range(struct vm_area_struct *vma,