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kcsan: Simplify debugfs counter to name mapping 

Simplify counter ID to name mapping by using an array with designated
inits. This way, we can turn a run-time BUG() into a compile-time static
assertion failure if a counter name is missing.

No functional change intended.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Marco Elver 2020-07-31 10:17:19 +02:00 committed by Paul E. McKenney
parent 3570a1bcf4
commit 69b2c81bc8
1 changed files with 13 additions and 20 deletions
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33
kernel/kcsan/debugfs.c
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@ -19,6 +19,18 @@
* Statistics counters.
*/
static atomic_long_t counters[KCSAN_COUNTER_COUNT];
static const char *const counter_names[] = {
[KCSAN_COUNTER_USED_WATCHPOINTS] = "used_watchpoints",
[KCSAN_COUNTER_SETUP_WATCHPOINTS] = "setup_watchpoints",
[KCSAN_COUNTER_DATA_RACES] = "data_races",
[KCSAN_COUNTER_ASSERT_FAILURES] = "assert_failures",
[KCSAN_COUNTER_NO_CAPACITY] = "no_capacity",
[KCSAN_COUNTER_REPORT_RACES] = "report_races",
[KCSAN_COUNTER_RACES_UNKNOWN_ORIGIN] = "races_unknown_origin",
[KCSAN_COUNTER_UNENCODABLE_ACCESSES] = "unencodable_accesses",
[KCSAN_COUNTER_ENCODING_FALSE_POSITIVES] = "encoding_false_positives",
};
static_assert(ARRAY_SIZE(counter_names) == KCSAN_COUNTER_COUNT);
/*
* Addresses for filtering functions from reporting. This list can be used as a
@ -39,24 +51,6 @@ static struct {
};
static DEFINE_SPINLOCK(report_filterlist_lock);
static const char *counter_to_name(enum kcsan_counter_id id)
{
switch (id) {
case KCSAN_COUNTER_USED_WATCHPOINTS: return "used_watchpoints";
case KCSAN_COUNTER_SETUP_WATCHPOINTS: return "setup_watchpoints";
case KCSAN_COUNTER_DATA_RACES: return "data_races";
case KCSAN_COUNTER_ASSERT_FAILURES: return "assert_failures";
case KCSAN_COUNTER_NO_CAPACITY: return "no_capacity";
case KCSAN_COUNTER_REPORT_RACES: return "report_races";
case KCSAN_COUNTER_RACES_UNKNOWN_ORIGIN: return "races_unknown_origin";
case KCSAN_COUNTER_UNENCODABLE_ACCESSES: return "unencodable_accesses";
case KCSAN_COUNTER_ENCODING_FALSE_POSITIVES: return "encoding_false_positives";
case KCSAN_COUNTER_COUNT:
BUG();
}
return NULL;
}
void kcsan_counter_inc(enum kcsan_counter_id id)
{
atomic_long_inc(&counters[id]);
@ -271,8 +265,7 @@ static int show_info(struct seq_file *file, void *v)
/* show stats */
seq_printf(file, "enabled: %i\n", READ_ONCE(kcsan_enabled));
for (i = 0; i < KCSAN_COUNTER_COUNT; ++i)
seq_printf(file, "%s: %ld\n", counter_to_name(i),
atomic_long_read(&counters[i]));
seq_printf(file, "%s: %ld\n", counter_names[i], atomic_long_read(&counters[i]));
/* show filter functions, and filter type */
spin_lock_irqsave(&report_filterlist_lock, flags);