tmpfs: mpol=bind:0 don't cause mount error.

Currently, following mount operation cause mount error.

% mount -t tmpfs -ompol=bind:0 none /tmp

Because commit 71fe804b6d5 (mempolicy: use struct mempolicy pointer in
shmem_sb_info) corrupted MPOL_BIND parse code.

This patch restore the needed one.

Signed-off-by: KOSAKI Motohiro <[email protected]>
Cc: Ravikiran Thirumalai <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Mel Gorman <[email protected]>
Acked-by: Lee Schermerhorn <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 745ce90308a6c89d5bc823339c7e6a8f69f90332..10db44f957496254d98fbb90fea40739e0367139 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2222,9 +2222,13 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
                if (!nodelist)
                        err = 0;
                goto out;
-       /*
-        * case MPOL_BIND:    mpol_new() enforces non-empty nodemask.
-        */
+       case MPOL_BIND:
+               /*
+                * Insist on a nodelist
+                */
+               if (!nodelist)
+                       goto out;
+               err = 0;
        }
 
        mode_flags = 0;