Merge branch 'akpm' (incoming from Andrew)

Merge second patch-bomb from Andrew Morton:
 - various misc bits
 - the rest of MM
 - add generic fixmap.h, use it
 - backlight updates
 - dynamic_debug updates
 - printk() updates
 - checkpatch updates
 - binfmt_elf
 - ramfs
 - init/
 - autofs4
 - drivers/rtc
 - nilfs
 - hfsplus
 - Documentation/
 - coredump
 - procfs
 - fork
 - exec
 - kexec
 - kdump
 - partitions
 - rapidio
 - rbtree
 - userns
 - memstick
 - w1
 - decompressors

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (197 commits)
  lib/decompress_unlz4.c: always set an error return code on failures
  romfs: fix returm err while getting inode in fill_super
  drivers/w1/masters/w1-gpio.c: add strong pullup emulation
  drivers/memstick/host/rtsx_pci_ms.c: fix ms card data transfer bug
  userns: relax the posix_acl_valid() checks
  arch/sh/kernel/dwarf.c: use rbtree postorder iteration helper instead of solution using repeated rb_erase()
  fs-ext3-use-rbtree-postorder-iteration-helper-instead-of-opencoding-fix
  fs/ext3: use rbtree postorder iteration helper instead of opencoding
  fs/jffs2: use rbtree postorder iteration helper instead of opencoding
  fs/ext4: use rbtree postorder iteration helper instead of opencoding
  fs/ubifs: use rbtree postorder iteration helper instead of opencoding
  net/netfilter/ipset/ip_set_hash_netiface.c: use rbtree postorder iteration instead of opencoding
  rbtree/test: test rbtree_postorder_for_each_entry_safe()
  rbtree/test: move rb_node to the middle of the test struct
  rapidio: add modular rapidio core build into powerpc and mips branches
  partitions/efi: complete documentation of gpt kernel param purpose
  kdump: add /sys/kernel/vmcoreinfo ABI documentation
  kdump: fix exported size of vmcoreinfo note
  kexec: add sysctl to disable kexec_load
  fs/exec.c: call arch_pick_mmap_layout() only once
  ...

1 files changed, 4 insertions, 29 deletions

diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c
index 3f11656bd72e..41eb9dcfac7e 100644
--- a/fs/ext4/block_validity.c
+++ b/fs/ext4/block_validity.c
@@ -180,37 +180,12 @@ int ext4_setup_system_zone(struct super_block *sb)
 /* Called when the filesystem is unmounted */
 void ext4_release_system_zone(struct super_block *sb)
 {
-	struct rb_node	*n = EXT4_SB(sb)->system_blks.rb_node;
-	struct rb_node	*parent;
-	struct ext4_system_zone	*entry;
+	struct ext4_system_zone	*entry, *n;
 
-	while (n) {
-		/* Do the node's children first */
-		if (n->rb_left) {
-			n = n->rb_left;
-			continue;
-		}
-		if (n->rb_right) {
-			n = n->rb_right;
-			continue;
-		}
-		/*
-		 * The node has no children; free it, and then zero
-		 * out parent's link to it.  Finally go to the
-		 * beginning of the loop and try to free the parent
-		 * node.
-		 */
-		parent = rb_parent(n);
-		entry = rb_entry(n, struct ext4_system_zone, node);
+	rbtree_postorder_for_each_entry_safe(entry, n,
+			&EXT4_SB(sb)->system_blks, node)
 		kmem_cache_free(ext4_system_zone_cachep, entry);
-		if (!parent)
-			EXT4_SB(sb)->system_blks = RB_ROOT;
-		else if (parent->rb_left == n)
-			parent->rb_left = NULL;
-		else if (parent->rb_right == n)
-			parent->rb_right = NULL;
-		n = parent;
-	}
+
 	EXT4_SB(sb)->system_blks = RB_ROOT;
 }