Merge remote-tracking branch 'upstream' into next

 - bring back critical fixes (esp. aa67f6096c19bc)
 - provide an updated base for development

* upstream: (4334 commits)
  missed mnt_drop_write() in do_dentry_open()
  UBIFS: nuke pdflush from comments
  gfs2: nuke pdflush from comments
  drbd: nuke pdflush from comments
  nilfs2: nuke write_super from comments
  hfs: nuke write_super from comments
  vfs: nuke pdflush from comments
  jbd/jbd2: nuke write_super from comments
  btrfs: nuke pdflush from comments
  btrfs: nuke write_super from comments
  ext4: nuke pdflush from comments
  ext4: nuke write_super from comments
  ext3: nuke write_super from comments
  Documentation: fix the VM knobs descritpion WRT pdflush
  Documentation: get rid of write_super
  vfs: kill write_super and sync_supers
  ACPI processor: Fix tick_broadcast_mask online/offline regression
  ACPI: Only count valid srat memory structures
  ACPI: Untangle a return statement for better readability
  Linux 3.6-rc1
  ...

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index a03b5a7059e2..f15f82bf3a50 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -395,4 +395,13 @@ config ARM_KPROBES_TEST
         help
           Perform tests of kprobes API and instruction set simulation.
 
+config PID_IN_CONTEXTIDR
+        bool "Write the current PID to the CONTEXTIDR register"
+        depends on CPU_COPY_V6
+        help
+          Enabling this option causes the kernel to write the current PID to
+          the PROCID field of the CONTEXTIDR register, at the expense of some
+          additional instructions during context switch. Say Y here only if you
+          are planning to use hardware trace tools with this kernel.
+
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