Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "14 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  kernel/sysctl.c: fix out-of-bounds access when setting file-max
  mm/util.c: fix strndup_user() comment
  sh: fix multiple function definition build errors
  MAINTAINERS: add maintainer and replacing reviewer ARM/NUVOTON NPCM
  MAINTAINERS: fix bad pattern in ARM/NUVOTON NPCM
  mm: writeback: use exact memcg dirty counts
  psi: clarify the units used in pressure files
  mm/huge_memory.c: fix modifying of page protection by insert_pfn_pmd()
  hugetlbfs: fix memory leak for resv_map
  mm: fix vm_fault_t cast in VM_FAULT_GET_HINDEX()
  lib/lzo: fix bugs for very short or empty input
  include/linux/bitrev.h: fix constant bitrev
  kmemleak: powerpc: skip scanning holes in the .bss section
  lib/string.c: implement a basic bcmp

1 files changed, 14 insertions, 6 deletions

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index ec32fece5e1e..9285dd4f4b1c 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -755,11 +755,17 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
                                         umode_t mode, dev_t dev)
 {
         struct inode *inode;
-        struct resv_map *resv_map;
+        struct resv_map *resv_map = NULL;
 
-        resv_map = resv_map_alloc();
-        if (!resv_map)
-                return NULL;
+        /*
+         * Reserve maps are only needed for inodes that can have associated
+         * page allocations.
+         */
+        if (S_ISREG(mode) || S_ISLNK(mode)) {
+                resv_map = resv_map_alloc();
+                if (!resv_map)
+                        return NULL;
+        }
 
         inode = new_inode(sb);
         if (inode) {
@@ -794,8 +800,10 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
                         break;
                 }
                 lockdep_annotate_inode_mutex_key(inode);
-        } else
-                kref_put(&resv_map->refs, resv_map_release);
+        } else {
+                if (resv_map)
+                        kref_put(&resv_map->refs, resv_map_release);
+        }
 
         return inode;
 }