[PATCH] ppc64: Mark kernel hptes dirty

We dont use the hardware referenced and changed bits and setting them early
avoids a store to memory.  We already do this for userspace hptes but not
kernel ones.  Do it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/ppc64/mm/hash_utils.c b/arch/ppc64/mm/hash_utils.c
index 87d0525..1647b1c 100644 (file)
--- a/arch/ppc64/mm/hash_utils.c
+++ b/arch/ppc64/mm/hash_utils.c
@@ -195,7 +195,7 @@ void __init htab_initialize(void)
                memset((void *)table, 0, htab_size_bytes);
        }
 
-       mode_rw = _PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX;
+       mode_rw = _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX;
 
        /* On U3 based machines, we need to reserve the DART area and
         * _NOT_ map it to avoid cache paradoxes as it's remapped non