Merge from stable-2.6.32.51

Merge commit 'v2.6.32.51' into xen/next-2.6.32

* commit 'v2.6.32.51':
  Linux 2.6.32.51
  USB: cdc-acm: add IDs for Motorola H24 HSPA USB module.
  ext4: avoid hangs in ext4_da_should_update_i_disksize()
  oprofile, x86: Fix crash when unloading module (timer mode)
  oprofile, x86: Fix nmi-unsafe callgraph support
  export __get_user_pages_fast() function
  hfs: fix hfs_find_init() sb->ext_tree NULL ptr oops
  Make TASKSTATS require root access
  jbd/jbd2: validate sb->s_first in journal_get_superblock()
  linux/log2.h: Fix rounddown_pow_of_two(1)
  xfrm: Fix key lengths for rfc3686(ctr(aes))
  percpu: fix chunk range calculation
  oprofile: Fix locking dependency in sync_start()
  oprofile: Free potentially owned tasks in case of errors
  ARM: davinci: dm646x evm: wrong register used in setup_vpif_input_channel_mode
  ALSA: hda/realtek - Fix Oops in alc_mux_select()
  ALSA: sis7019 - give slow codecs more time to reset