locking/lockdep: Display irq_context names in /proc/lockdep_chains (b9875e98) · Commits · 戴 / test

Currently, the irq_context field of a lock chains displayed in /proc/lockdep_chains is just a number. It is likely that many people may not know what a non-zero number means. To make the information more useful, print the actual irq names ("softirq" and "hardirq") instead. Signed-off-by:

Waiman Long <longman@redhat.com> Signed-off-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:

Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20200206152408.24165-3-longman@redhat.com

kernel/locking/lockdep_proc.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -128,6 +128,13 @@ static int lc_show(struct seq_file m, void v)
		struct lock_chain *chain = v;
		struct lock_class *class;
		int i;
		static const char * const irq_strs[] = {
		[0] = "0",
		[LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq",
		[LOCK_CHAIN_SOFTIRQ_CONTEXT] = "softirq",
		[LOCK_CHAIN_SOFTIRQ_CONTEXT\|
		LOCK_CHAIN_HARDIRQ_CONTEXT] = "hardirq\|softirq",
		};

		if (v == SEQ_START_TOKEN) {
		if (nr_chain_hlocks > MAX_LOCKDEP_CHAIN_HLOCKS)
		@@ -136,7 +143,7 @@ static int lc_show(struct seq_file m, void v)
		return 0;
		}

		seq_printf(m, "irq_context: %d\n", chain->irq_context);
		seq_printf(m, "irq_context: %s\n", irq_strs[chain->irq_context]);

		for (i = 0; i < chain->depth; i++) {
		class = lock_chain_get_class(chain, i);

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