locking/lockdep: Fix ->irq_context calculation
task_irq_context() returns the encoded irq_context of the task, the return value is encoded in the same as ->irq_context of held_lock. Always return 0 if !(CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING) Signed-off-by: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: sasha.levin@oracle.com Link: http://lkml.kernel.org/r/1455602265-16490-2-git-send-email-boqun.feng@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -2932,6 +2932,11 @@ static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
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return 1;
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}
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static inline unsigned int task_irq_context(struct task_struct *task)
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{
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return 2 * !!task->hardirq_context + !!task->softirq_context;
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}
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static int separate_irq_context(struct task_struct *curr,
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struct held_lock *hlock)
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{
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@ -2940,8 +2945,6 @@ static int separate_irq_context(struct task_struct *curr,
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/*
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* Keep track of points where we cross into an interrupt context:
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*/
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hlock->irq_context = 2*(curr->hardirq_context ? 1 : 0) +
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curr->softirq_context;
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if (depth) {
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struct held_lock *prev_hlock;
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@ -2973,6 +2976,11 @@ static inline int mark_irqflags(struct task_struct *curr,
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return 1;
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}
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static inline unsigned int task_irq_context(struct task_struct *task)
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{
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return 0;
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}
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static inline int separate_irq_context(struct task_struct *curr,
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struct held_lock *hlock)
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{
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@ -3241,6 +3249,7 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
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hlock->acquire_ip = ip;
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hlock->instance = lock;
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hlock->nest_lock = nest_lock;
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hlock->irq_context = task_irq_context(curr);
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hlock->trylock = trylock;
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hlock->read = read;
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hlock->check = check;
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