Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull core locking changes from Ingo Molnar:
 "The biggest changes:

   - add lockdep support for seqcount/seqlocks structures, this
     unearthed both bugs and required extra annotation.

   - move the various kernel locking primitives to the new
     kernel/locking/ directory"

* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits)
  block: Use u64_stats_init() to initialize seqcounts
  locking/lockdep: Mark __lockdep_count_forward_deps() as static
  lockdep/proc: Fix lock-time avg computation
  locking/doc: Update references to kernel/mutex.c
  ipv6: Fix possible ipv6 seqlock deadlock
  cpuset: Fix potential deadlock w/ set_mems_allowed
  seqcount: Add lockdep functionality to seqcount/seqlock structures
  net: Explicitly initialize u64_stats_sync structures for lockdep
  locking: Move the percpu-rwsem code to kernel/locking/
  locking: Move the lglocks code to kernel/locking/
  locking: Move the rwsem code to kernel/locking/
  locking: Move the rtmutex code to kernel/locking/
  locking: Move the semaphore core to kernel/locking/
  locking: Move the spinlock code to kernel/locking/
  locking: Move the lockdep code to kernel/locking/
  locking: Move the mutex code to kernel/locking/
  hung_task debugging: Add tracepoint to report the hang
  x86/locking/kconfig: Update paravirt spinlock Kconfig description
  lockstat: Report avg wait and hold times
  lockdep, x86/alternatives: Drop ancient lockdep fixup message
  ...

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index a9dd384c5e80..0a38ef8d7f00 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -2606,7 +2606,7 @@ static void __d_move(struct dentry * dentry, struct dentry * target)
         dentry_lock_for_move(dentry, target);
 
         write_seqcount_begin(&dentry->d_seq);
-        write_seqcount_begin(&target->d_seq);
+        write_seqcount_begin_nested(&target->d_seq, DENTRY_D_LOCK_NESTED);
 
         /* __d_drop does write_seqcount_barrier, but they're OK to nest. */
 
@@ -2738,7 +2738,7 @@ static void __d_materialise_dentry(struct dentry *dentry, struct dentry *anon)
         dentry_lock_for_move(anon, dentry);
 
         write_seqcount_begin(&dentry->d_seq);
-        write_seqcount_begin(&anon->d_seq);
+        write_seqcount_begin_nested(&anon->d_seq, DENTRY_D_LOCK_NESTED);
 
         dparent = dentry->d_parent;