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locking/lockdep: Display irq_context names in /proc/lockdep_chains

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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
This commit is contained in:
Waiman Long 2020-02-06 10:24:04 -05:00 committed by Ingo Molnar
parent b3b9c187dc
commit b9875e9882
1 changed files with 8 additions and 1 deletions
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9
kernel/locking/lockdep_proc.c
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@ -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);