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@@ -3059,6 +3059,19 @@ __lock_release(struct lockdep_map *lock, int nested, unsigned long ip)
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check_chain_key(curr);
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}
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+static int __lock_is_held(struct lockdep_map *lock)
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+{
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+ struct task_struct *curr = current;
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+ int i;
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+
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+ for (i = 0; i < curr->lockdep_depth; i++) {
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+ if (curr->held_locks[i].instance == lock)
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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/*
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* Check whether we follow the irq-flags state precisely:
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*/
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@@ -3160,6 +3173,26 @@ void lock_release(struct lockdep_map *lock, int nested,
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}
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EXPORT_SYMBOL_GPL(lock_release);
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+int lock_is_held(struct lockdep_map *lock)
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+{
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+ unsigned long flags;
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+ int ret = 0;
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+
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+ if (unlikely(current->lockdep_recursion))
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+ return ret;
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+
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+ raw_local_irq_save(flags);
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+ check_flags(flags);
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+
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+ current->lockdep_recursion = 1;
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+ ret = __lock_is_held(lock);
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+ current->lockdep_recursion = 0;
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+ raw_local_irq_restore(flags);
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+
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+ return ret;
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+}
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+EXPORT_SYMBOL_GPL(lock_is_held);
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+
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void lockdep_set_current_reclaim_state(gfp_t gfp_mask)
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{
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current->lockdep_reclaim_gfp = gfp_mask;
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