[PATCH] fix update_mmu_cache in fremap.c

There are two calls to update_mmu_cache in fremap.c, both defective.
The one in install_page needs to be accompanied by lazy_mmu_prot_update
(some other cleanup time, move that into ia64 update_mmu_cache itself); and
the one in install_file_pte should be removed since the pte is not present.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/mm/fremap.c b/mm/fremap.c
index 9f381e58bf44..21b7d0cbc98c 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -83,6 +83,7 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma,
         page_add_file_rmap(page);
         pte_val = *pte;
         update_mmu_cache(vma, addr, pte_val);
+        lazy_mmu_prot_update(pte_val);
         err = 0;
 unlock:
         pte_unmap_unlock(pte, ptl);
@@ -114,7 +115,13 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma,
 
         set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff));
         pte_val = *pte;
-        update_mmu_cache(vma, addr, pte_val);
+        /*
+         * We don't need to run update_mmu_cache() here because the "file pte"
+         * being installed by install_file_pte() is not a real pte - it's a
+         * non-present entry (like a swap entry), noting what file offset should
+         * be mapped there when there's a fault (in a non-linear vma where
+         * that's not obvious).
+         */
         pte_unmap_unlock(pte, ptl);
         err = 0;
 out: