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

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* 'core-printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  lockdep: Fix trace_[soft,hard]irqs_[on,off]() recursion
  printk: Fix console_sem vs logbuf_lock unlock race
  printk: Release console_sem after logbuf_lock
This commit is contained in:
Linus Torvalds
2011-07-22 16:43:49 -07:00
parent 75b56ec294 dd4e5d3ac4
commit 391d6276db
2 changed files with 41 additions and 13 deletions
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30
kernel/lockdep.c
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@@ -2481,15 +2481,10 @@ mark_held_locks(struct task_struct *curr, enum mark_type mark)
/*
* Hardirqs will be enabled:
*/
void trace_hardirqs_on_caller(unsigned long ip)
static void __trace_hardirqs_on_caller(unsigned long ip)
{
struct task_struct *curr = current;
time_hardirqs_on(CALLER_ADDR0, ip);
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
if (DEBUG_LOCKS_WARN_ON(unlikely(early_boot_irqs_disabled)))
return;
@@ -2505,8 +2500,6 @@ void trace_hardirqs_on_caller(unsigned long ip)
/* we'll do an OFF -> ON transition: */
curr->hardirqs_enabled = 1;
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
if (DEBUG_LOCKS_WARN_ON(current->hardirq_context))
return;
/*
@@ -2528,6 +2521,21 @@ void trace_hardirqs_on_caller(unsigned long ip)
curr->hardirq_enable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_on_events);
}
void trace_hardirqs_on_caller(unsigned long ip)
{
time_hardirqs_on(CALLER_ADDR0, ip);
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
current->lockdep_recursion = 1;
__trace_hardirqs_on_caller(ip);
current->lockdep_recursion = 0;
}
EXPORT_SYMBOL(trace_hardirqs_on_caller);
void trace_hardirqs_on(void)
@@ -2577,7 +2585,7 @@ void trace_softirqs_on(unsigned long ip)
{
struct task_struct *curr = current;
if (unlikely(!debug_locks))
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
@@ -2588,6 +2596,7 @@ void trace_softirqs_on(unsigned long ip)
return;
}
current->lockdep_recursion = 1;
/*
* We'll do an OFF -> ON transition:
*/
@@ -2602,6 +2611,7 @@ void trace_softirqs_on(unsigned long ip)
*/
if (curr->hardirqs_enabled)
mark_held_locks(curr, SOFTIRQ);
current->lockdep_recursion = 0;
}
/*
@@ -2611,7 +2621,7 @@ void trace_softirqs_off(unsigned long ip)
{
struct task_struct *curr = current;
if (unlikely(!debug_locks))
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))