linux-toradex.git/kernel/rcu/tree.c, branch v3.16-rc5

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

2014-06-03T19:57:53+00:00

Pull core locking updates from Ingo Molnar:
 "The main changes in this cycle were:

   - reduced/streamlined smp_mb__*() interface that allows more usecases
     and makes the existing ones less buggy, especially in rarer
     architectures

   - add rwsem implementation comments

   - bump up lockdep limits"

* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (33 commits)
  rwsem: Add comments to explain the meaning of the rwsem's count field
  lockdep: Increase static allocations
  arch: Mass conversion of smp_mb__*()
  arch,doc: Convert smp_mb__*()
  arch,xtensa: Convert smp_mb__*()
  arch,x86: Convert smp_mb__*()
  arch,tile: Convert smp_mb__*()
  arch,sparc: Convert smp_mb__*()
  arch,sh: Convert smp_mb__*()
  arch,score: Convert smp_mb__*()
  arch,s390: Convert smp_mb__*()
  arch,powerpc: Convert smp_mb__*()
  arch,parisc: Convert smp_mb__*()
  arch,openrisc: Convert smp_mb__*()
  arch,mn10300: Convert smp_mb__*()
  arch,mips: Convert smp_mb__*()
  arch,metag: Convert smp_mb__*()
  arch,m68k: Convert smp_mb__*()
  arch,m32r: Convert smp_mb__*()
  arch,ia64: Convert smp_mb__*()
  ...

rcu: Variable name changed in tree_plugin.h and used in tree.c

2014-05-14T18:41:04+00:00

The variable and struct both having the name "rcu_state" confuses
sparse in some situations, so this commit changes the variable to
"rcu_state_p" in order to avoid this confusion.  This also makes
things easier for human readers.

Signed-off-by: Uma Sharma 
[ paulmck: Changed the declaration and several additional uses. ]
Signed-off-by: Paul E. McKenney

Merge branches 'doc.2014.04.29a', 'fixes.2014.04.29a' and 'torture.2014.05.14a' into HEAD

2014-05-14T17:57:31+00:00

doc.2014.04.29a:  Documentation updates.
fixes.2014.04.29a:  Miscellaneous fixes.
torture.2014.05.14a:  RCU/Lock torture tests.

rcutorture: Export RCU grace-period kthread wait state to rcutorture

2014-05-14T16:46:09+00:00

This commit allows rcutorture to print additional state for the
RCU grace-period kthreads in cases where RCU seems reluctant to
start a new grace period.

Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcutorture: Add forward-progress checking for writer

2014-05-13T18:18:18+00:00

The rcutorture output currently does not distinguish between stalls in
the RCU implementation and stalls in the rcu_torture_writer() kthreads.
This commit therefore adds some diagnostics to help distinguish between
these two conditions, at least for the non-SRCU implementations.  (SRCU
does not provide evidence of update-side forward progress by design.)

Signed-off-by: Paul E. McKenney

rcu: Replace __this_cpu_ptr() uses with raw_cpu_ptr()

2014-04-29T15:45:35+00:00

__this_cpu_ptr is being phased out.

One special case is increment_cpu_stall_ticks().
A per cpu variable is incremented so use raw_cpu_inc().

Cc: Dipankar Sarma 
Signed-off-by: Christoph Lameter 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Remove duplicate resched_cpu() declaration

2014-04-29T15:45:29+00:00

Signed-off-by: Pranith Kumar 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Merge rcu_sched_force_quiescent_state() with rcu_force_quiescent_state()

2014-04-29T15:45:07+00:00

This patch merges the function rcu_force_quiescent_state() with
rcu_sched_force_quiescent_state(), using the rcu_state pointer.  Firstly,
the rcu_sched_force_quiescent_state() function is deleted from the file
kernel/rcu/tree.c. Also, the rcu_force_quiescent_state() function that was
calling force_quiescent_state with the argument rcu_preempt_state pointer
was deleted as well.  The new function that combines the old ones uses
the rcu_state pointer and is located after rcu_batches_completed_bh()
in kernel/rcu/tree.c.

Signed-off-by: Andreea-Cristina Bernat 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Consolidate kfree_call_rcu() to use rcu_state pointer

2014-04-29T15:45:01+00:00

kfree_call_rcu is defined two times. When defined under CONFIG_TREE_PREEMPT_RCU,
it uses rcu_preempt_state. Otherwise, it uses rcu_sched_state.
This patch uses the rcu_state_pointer to combine the two definitions into one.
The resulting function is placed after the closing of the preprocessor
conditional CONFIG_TREE_PREEMPT_RCU.

Signed-off-by: Andreea-Cristina Bernat 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett

rcu: Replace NR_CPUS with nr_cpu_ids

2014-04-29T15:44:55+00:00

This patch replaces NR_CPUS with nr_cpu_ids as NR_CPUS should
consider cpumask_var_t.

Signed-off-by: Himangi Saraogi 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett