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lockdep: fix irqs on/off ip tracing 

Impact: fix lockdep lock-api-caller output when irqsoff tracing is enabled

81d68a96 "ftrace: trace irq disabled critical timings" added wrappers around
trace_hardirqs_on/off_caller. However these functions use
__builtin_return_address(0) to figure out which function actually disabled
or enabled irqs. The result is that we save the ips of trace_hardirqs_on/off
instead of the real caller. Not very helpful.

However since the patch from Steven the ip already gets passed. So use that
and get rid of __builtin_return_address(0) in these two functions.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Heiko Carstens 2008-10-28 11:14:58 +01:00 committed by Ingo Molnar
parent 46fec7ac40
commit 6afe40b4da
1 changed files with 5 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
kernel/lockdep.c
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@ -2169,12 +2169,11 @@ void early_boot_irqs_on(void)
/*
* Hardirqs will be enabled:
*/
void trace_hardirqs_on_caller(unsigned long a0)
void trace_hardirqs_on_caller(unsigned long ip)
{
struct task_struct *curr = current;
unsigned long ip;
time_hardirqs_on(CALLER_ADDR0, a0);
time_hardirqs_on(CALLER_ADDR0, ip);
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
@ -2188,7 +2187,6 @@ void trace_hardirqs_on_caller(unsigned long a0)
}
/* we'll do an OFF -> ON transition: */
curr->hardirqs_enabled = 1;
ip = (unsigned long) __builtin_return_address(0);
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
@ -2224,11 +2222,11 @@ EXPORT_SYMBOL(trace_hardirqs_on);
/*
* Hardirqs were disabled:
*/
void trace_hardirqs_off_caller(unsigned long a0)
void trace_hardirqs_off_caller(unsigned long ip)
{
struct task_struct *curr = current;
time_hardirqs_off(CALLER_ADDR0, a0);
time_hardirqs_off(CALLER_ADDR0, ip);
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
@ -2241,7 +2239,7 @@ void trace_hardirqs_off_caller(unsigned long a0)
* We have done an ON -> OFF transition:
*/
curr->hardirqs_enabled = 0;
curr->hardirq_disable_ip = _RET_IP_;
curr->hardirq_disable_ip = ip;
curr->hardirq_disable_event = ++curr->irq_events;
debug_atomic_inc(&hardirqs_off_events);
} else