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Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  smp: Document transitivity for memory barriers.
  rcu: add comment saying why DEBUG_OBJECTS_RCU_HEAD depends on PREEMPT.
  rcupdate: remove dead code
  rcu: add documentation saying which RCU flavor to choose
  rcutorture: Get rid of duplicate sched.h include
  rcu: call __rcu_read_unlock() in exit_rcu for tiny RCU
This commit is contained in:
Linus Torvalds
2011-03-16 08:10:07 -07:00
parent 34d211a2d5 241e6663b5
commit 016aa2ed1c
5 changed files with 95 additions and 7 deletions
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10
kernel/rcupdate.c
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@@ -214,11 +214,12 @@ static int rcuhead_fixup_free(void *addr, enum debug_obj_state state)
* Ensure that queued callbacks are all executed.
* If we detect that we are nested in a RCU read-side critical
* section, we should simply fail, otherwise we would deadlock.
* Note that the machinery to reliably determine whether
* or not we are in an RCU read-side critical section
* exists only in the preemptible RCU implementations
* (TINY_PREEMPT_RCU and TREE_PREEMPT_RCU), which is why
* DEBUG_OBJECTS_RCU_HEAD is disallowed if !PREEMPT.
*/
#ifndef CONFIG_PREEMPT
WARN_ON(1);
return 0;
#else
if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||
irqs_disabled()) {
WARN_ON(1);
@@ -229,7 +230,6 @@ static int rcuhead_fixup_free(void *addr, enum debug_obj_state state)
rcu_barrier_bh();
debug_object_free(head, &rcuhead_debug_descr);
return 1;
#endif
default:
return 0;
}

2
kernel/rcutiny_plugin.h
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@@ -852,7 +852,7 @@ void exit_rcu(void)
if (t->rcu_read_lock_nesting == 0)
return;
t->rcu_read_lock_nesting = 1;
rcu_read_unlock();
__rcu_read_unlock();
}
#else /* #ifdef CONFIG_TINY_PREEMPT_RCU */

1
kernel/rcutorture.c
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@@ -47,7 +47,6 @@
#include <linux/srcu.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <linux/sched.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and "