[PATCH] tmpfs: CONFIG_TMPFS=n mount fix

My tmpfs superblock changes in 2.6.9 messed up mount -t tmpfs when
CONFIG_TMPFS is not enabled: it wrongly claimed to succeed, and left the
directory unusable, giving "Not a directory" errors thereafter.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/shmem.c

@@ -1986,6 +1986,8 @@ static int shmem_fill_super(struct super_block *sb,
 		sbinfo->free_inodes = inodes;
 	}
 	sb->s_xattr = shmem_xattr_handlers;
+#else
+	sb->s_flags |= MS_NOUSER;
 #endif
 
 	sb->s_maxbytes = SHMEM_MAX_BYTES;