powerpc/mm: Free up _PAGE_COHERENCE for numa fault use later

Set  memory coherence always on hash64 config. If
a platform cannot have memory coherence always set they
can infer that from _PAGE_NO_CACHE and _PAGE_WRITETHRU
like in lpar. So we dont' really need a separate bit
for tracking _PAGE_COHERENCE.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/powerpc/mm/hugepage-hash64.c b/arch/powerpc/mm/hugepage-hash64.c
index 34de9e0cdc34..826893fcb3a7 100644
--- a/arch/powerpc/mm/hugepage-hash64.c
+++ b/arch/powerpc/mm/hugepage-hash64.c
@@ -127,7 +127,11 @@ repeat:
 
                 /* Add in WIMG bits */
                 rflags |= (new_pmd & (_PAGE_WRITETHRU | _PAGE_NO_CACHE |
-                                      _PAGE_COHERENT | _PAGE_GUARDED));
+                                      _PAGE_GUARDED));
+                /*
+                 * enable the memory coherence always
+                 */
+                rflags |= HPTE_R_M;
 
                 /* Insert into the hash table, primary slot */
                 slot = ppc_md.hpte_insert(hpte_group, vpn, pa, rflags, 0,