lockdep: Use this_cpu_ptr instead of get_cpu_var stats
get_cpu_var disables preemption which has the potential to call into the preemption disable trace points causing some complications. There's also no need to disable preemption in uses of get_lock_stats anyway since preempt is already disabled. So lets simplify the code. Link: http://lkml.kernel.org/r/20180730222423.196630-2-joel@joelfernandes.org Suggested-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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1 changed files with 1 additions and 9 deletions
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@ -248,12 +248,7 @@ void clear_lock_stats(struct lock_class *class)
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static struct lock_class_stats *get_lock_stats(struct lock_class *class)
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{
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return &get_cpu_var(cpu_lock_stats)[class - lock_classes];
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}
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static void put_lock_stats(struct lock_class_stats *stats)
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{
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put_cpu_var(cpu_lock_stats);
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return &this_cpu_ptr(cpu_lock_stats)[class - lock_classes];
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}
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static void lock_release_holdtime(struct held_lock *hlock)
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@ -271,7 +266,6 @@ static void lock_release_holdtime(struct held_lock *hlock)
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lock_time_inc(&stats->read_holdtime, holdtime);
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else
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lock_time_inc(&stats->write_holdtime, holdtime);
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put_lock_stats(stats);
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}
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#else
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static inline void lock_release_holdtime(struct held_lock *hlock)
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@ -4090,7 +4084,6 @@ __lock_contended(struct lockdep_map *lock, unsigned long ip)
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stats->contending_point[contending_point]++;
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if (lock->cpu != smp_processor_id())
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stats->bounces[bounce_contended + !!hlock->read]++;
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put_lock_stats(stats);
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}
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static void
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@ -4138,7 +4131,6 @@ __lock_acquired(struct lockdep_map *lock, unsigned long ip)
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}
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if (lock->cpu != cpu)
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stats->bounces[bounce_acquired + !!hlock->read]++;
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put_lock_stats(stats);
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lock->cpu = cpu;
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lock->ip = ip;
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