SLAB_PANIC more (proc, posix-timers, shmem)

These aren't modular, so SLAB_PANIC is OK.

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/shmem.c b/mm/shmem.c
index 2048657..6fa20a8 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2343,9 +2343,7 @@
 {
 	shmem_inode_cachep = kmem_cache_create("shmem_inode_cache",
 				sizeof(struct shmem_inode_info),
-				0, 0, init_once);
-	if (shmem_inode_cachep == NULL)
-		return -ENOMEM;
+				0, SLAB_PANIC, init_once);
 	return 0;
 }