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Date: Mon, 3 Jun 2019 06:09:17 -0700 From: tip-bot for Yuyang Du <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: peterz@...radead.org, torvalds@...ux-foundation.org, mingo@...nel.org, tglx@...utronix.de, hpa@...or.com, duyuyang@...il.com, linux-kernel@...r.kernel.org Subject: [tip:locking/core] locking/lockdep: Print the right depth for chain key collision Commit-ID: 834494b28024b39d45aea6bcc642b0fe94fe2503 Gitweb: https://git.kernel.org/tip/834494b28024b39d45aea6bcc642b0fe94fe2503 Author: Yuyang Du <duyuyang@...il.com> AuthorDate: Mon, 6 May 2019 16:19:21 +0800 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Mon, 3 Jun 2019 11:55:36 +0200 locking/lockdep: Print the right depth for chain key collision Since chains are separated by IRQ context, so when printing a chain the depth should be consistent with it. Signed-off-by: Yuyang Du <duyuyang@...il.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: bvanassche@....org Cc: frederic@...nel.org Cc: ming.lei@...hat.com Cc: will.deacon@....com Link: https://lkml.kernel.org/r/20190506081939.74287-6-duyuyang@gmail.com Signed-off-by: Ingo Molnar <mingo@...nel.org> --- kernel/locking/lockdep.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 3c477018e184..bc1efc12a8c5 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -2519,10 +2519,11 @@ print_chain_keys_held_locks(struct task_struct *curr, struct held_lock *hlock_ne struct held_lock *hlock; u64 chain_key = 0; int depth = curr->lockdep_depth; - int i; + int i = get_first_held_lock(curr, hlock_next); - printk("depth: %u\n", depth + 1); - for (i = get_first_held_lock(curr, hlock_next); i < depth; i++) { + printk("depth: %u (irq_context %u)\n", depth - i + 1, + hlock_next->irq_context); + for (; i < depth; i++) { hlock = curr->held_locks + i; chain_key = print_chain_key_iteration(hlock->class_idx, chain_key);
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