[PATCH 1/1] shmem: stop faulting in pages without checking inode->i_private

[Andrea Arcangeli]

Per shmem_fault comment shmem need to "refrain from faulting pages
into the hole while it's being punched" and to do so it must check
inode->i_private, which filemap_map_pages won't so it's unsafe to use
in shmem because it can leave ptes pointing to non-pagecache pages in
shmem backed vmas.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
 mm/shmem.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 8e2b35ba93ad..f6f29b3e67c6 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3942,7 +3942,6 @@ static const struct super_operations shmem_ops = {
 
 static const struct vm_operations_struct shmem_vm_ops = {
 	.fault		= shmem_fault,
-	.map_pages	= filemap_map_pages,
 #ifdef CONFIG_NUMA
 	.set_policy     = shmem_set_policy,
 	.get_policy     = shmem_get_policy,


Thanks,
Andrea