tmpfs: restore missing clear_highpage

tmpfs was misconverted to __GFP_ZERO in 2.6.11.  There's an unusual case in
which shmem_getpage receives the page from its caller instead of allocating.
We must cover this case by clear_highpage before SetPageUptodate, as before.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/mm/shmem.c b/mm/shmem.c
index 253d205914ba..51b3d6ccddab 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1072,7 +1072,7 @@ shmem_alloc_page(gfp_t gfp, struct shmem_inode_info *info,
         pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
         pvma.vm_pgoff = idx;
         pvma.vm_end = PAGE_SIZE;
-        page = alloc_page_vma(gfp | __GFP_ZERO, &pvma, 0);
+        page = alloc_page_vma(gfp, &pvma, 0);
         mpol_free(pvma.vm_policy);
         return page;
 }
@@ -1093,7 +1093,7 @@ shmem_swapin(struct shmem_inode_info *info,swp_entry_t entry,unsigned long idx)
 static inline struct page *
 shmem_alloc_page(gfp_t gfp,struct shmem_inode_info *info, unsigned long idx)
 {
-        return alloc_page(gfp | __GFP_ZERO);
+        return alloc_page(gfp);
 }
 #endif
 
@@ -1306,6 +1306,7 @@ repeat:
 
                 info->alloced++;
                 spin_unlock(&info->lock);
+                clear_highpage(filepage);
                 flush_dcache_page(filepage);
                 SetPageUptodate(filepage);
         }