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kcsan: Introduce kcsan_value_change type

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Introduces kcsan_value_change type, which explicitly points out if we
either observed a value-change (TRUE), or we could not observe one but
cannot rule out a value-change happened (MAYBE). The MAYBE state can
either be reported or not, depending on configuration preferences.

A follow-up patch introduces the FALSE state, which should never be
reported.

No functional change intended.

Acked-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Marco Elver
2020-02-11 17:04:21 +01:00
committed by Ingo Molnar
parent b968a08f24
commit b738f6169f
3 changed files with 54 additions and 29 deletions
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19
kernel/kcsan/kcsan.h
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@@ -88,6 +88,22 @@ extern void kcsan_counter_dec(enum kcsan_counter_id id);
*/
extern bool kcsan_skip_report_debugfs(unsigned long func_addr);
/*
* Value-change states.
*/
enum kcsan_value_change {
/*
* Did not observe a value-change, however, it is valid to report the
* race, depending on preferences.
*/
KCSAN_VALUE_CHANGE_MAYBE,
/*
* The value was observed to change, and the race should be reported.
*/
KCSAN_VALUE_CHANGE_TRUE,
};
enum kcsan_report_type {
/*
* The thread that set up the watchpoint and briefly stalled was
@@ -111,6 +127,7 @@ enum kcsan_report_type {
* Print a race report from thread that encountered the race.
*/
extern void kcsan_report(const volatile void *ptr, size_t size, int access_type,
bool value_change, int cpu_id, enum kcsan_report_type type);
enum kcsan_value_change value_change, int cpu_id,
enum kcsan_report_type type);
#endif /* _KERNEL_KCSAN_KCSAN_H */