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tracing: Partial revert of "tracing: Centralize preemptirq tracepoints and unify their usage"

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Joel Fernandes created a nice patch that cleaned up the duplicate hooks used
by lockdep and irqsoff latency tracer. It made both use tracepoints. But it
caused lockdep to trigger several false positives. We have not figured out
why yet, but removing lockdep from using the trace event hooks and just call
its helper functions directly (like it use to), makes the problem go away.

This is a partial revert of the clean up patch c3bc8fd637 ("tracing:
Centralize preemptirq tracepoints and unify their usage") that adds direct
calls for lockdep, but also keeps most of the clean up done to get rid of
the horrible preprocessor if statements.

Link: http://lkml.kernel.org/r/20180806155058.5ee875f4@gandalf.local.home

Cc: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Fixes: c3bc8fd637 ("tracing: Centralize preemptirq tracepoints and unify their usage")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware)
2018-08-06 15:50:58 -04:00
parent da5b3ebb45
commit bff1b208a5
5 changed files with 28 additions and 34 deletions
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14
kernel/locking/lockdep.c
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@@ -2840,8 +2840,7 @@ static void __trace_hardirqs_on_caller(unsigned long ip)
debug_atomic_inc(hardirqs_on_events);
}
static void lockdep_hardirqs_on(void *none, unsigned long ignore,
unsigned long ip)
void lockdep_hardirqs_on(unsigned long ip)
{
if (unlikely(!debug_locks || current->lockdep_recursion))
return;
@@ -2885,8 +2884,7 @@ static void lockdep_hardirqs_on(void *none, unsigned long ignore,
/*
* Hardirqs were disabled:
*/
static void lockdep_hardirqs_off(void *none, unsigned long ignore,
unsigned long ip)
void lockdep_hardirqs_off(unsigned long ip)
{
struct task_struct *curr = current;
@@ -4315,14 +4313,6 @@ out_restore:
raw_local_irq_restore(flags);
}
void __init lockdep_init_early(void)
{
#ifdef CONFIG_PROVE_LOCKING
register_trace_prio_irq_disable(lockdep_hardirqs_off, NULL, INT_MAX);
register_trace_prio_irq_enable(lockdep_hardirqs_on, NULL, INT_MIN);
#endif
}
void __init lockdep_init(void)
{
printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n");