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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2018-06-07 17:09:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-07 17:34:38 -0700
commitdaa280753cefa692607190852a98a9c06ae9ec9a (patch)
tree7781b91dd6a9c1f68fcc22b29a4b111747465c28 /mm/shmem.c
parent7810e6781e0fcbca78b91cf65053f895bf59e85f (diff)
mm/shmem.c: zero out unused vma fields in shmem_pseudo_vma_init()
shmem/tmpfs uses pseudo vma to allocate page with correct NUMA policy. The pseudo vma doesn't have vm_page_prot set. We are going to encode encryption KeyID in vm_page_prot. Having garbage there causes problems. Zero out all unused fields in the pseudo vma. Link: http://lkml.kernel.org/r/20180531135602.20321-1-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 2b686e3f53ad..e9a7ac74823d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1420,10 +1420,9 @@ static void shmem_pseudo_vma_init(struct vm_area_struct *vma,
struct shmem_inode_info *info, pgoff_t index)
{
/* Create a pseudo vma that just contains the policy */
- vma->vm_start = 0;
+ memset(vma, 0, sizeof(*vma));
/* Bias interleave by inode number to distribute better across nodes */
vma->vm_pgoff = index + info->vfs_inode.i_ino;
- vma->vm_ops = NULL;
vma->vm_policy = mpol_shared_policy_lookup(&info->policy, index);
}