mempolicy: remove case MPOL_INTERLEAVE from policy_zonelist()

In policy_zonelist() mode MPOL_INTERLEAVE shouldn't happen, so fall
through to BUG() instead of break to return.  I also fixed the comment.

Signed-off-by: Bob Liu <lliubbo@gmail.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index ad500f3b12bf..d97355b744ab 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1441,15 +1441,13 @@ static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy)
                 /*
                  * Normally, MPOL_BIND allocations are node-local within the
                  * allowed nodemask.  However, if __GFP_THISNODE is set and the
-                 * current node is part of the mask, we use the zonelist for
+                 * current node isn't part of the mask, we use the zonelist for
                  * the first node in the mask instead.
                  */
                 if (unlikely(gfp & __GFP_THISNODE) &&
                                 unlikely(!node_isset(nd, policy->v.nodes)))
                         nd = first_node(policy->v.nodes);
                 break;
-        case MPOL_INTERLEAVE: /* should not happen */
-                break;
         default:
                 BUG();
         }