kcsan: Introduce report access_info and other_info

Improve readability by introducing access_info and other_info structs,
and in preparation of the following commit in this series replaces the
single instance of other_info with an array of size 1.

No functional change intended.
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

kernel/kcsan/core.c

@@ -321,7 +321,7 @@ static noinline void kcsan_found_watchpoint(const volatile void *ptr,
 	flags = user_access_save();
 
 	if (consumed) {
-		kcsan_report(ptr, size, type, true, raw_smp_processor_id(),
+		kcsan_report(ptr, size, type, KCSAN_VALUE_CHANGE_MAYBE,
 			     KCSAN_REPORT_CONSUMED_WATCHPOINT);
 	} else {
 		/*
@@ -500,8 +500,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
 		if (is_assert && value_change == KCSAN_VALUE_CHANGE_TRUE)
 			kcsan_counter_inc(KCSAN_COUNTER_ASSERT_FAILURES);
 
-		kcsan_report(ptr, size, type, value_change, raw_smp_processor_id(),
-			     KCSAN_REPORT_RACE_SIGNAL);
+		kcsan_report(ptr, size, type, value_change, KCSAN_REPORT_RACE_SIGNAL);
 	} else if (value_change == KCSAN_VALUE_CHANGE_TRUE) {
 		/* Inferring a race, since the value should not have changed. */
 
@@ -511,7 +510,6 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
 
 		if (IS_ENABLED(CONFIG_KCSAN_REPORT_RACE_UNKNOWN_ORIGIN) || is_assert)
 			kcsan_report(ptr, size, type, KCSAN_VALUE_CHANGE_TRUE,
-				     raw_smp_processor_id(),
 				     KCSAN_REPORT_RACE_UNKNOWN_ORIGIN);
 	}
 

kernel/kcsan/kcsan.h

@@ -135,7 +135,7 @@ 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,
-			 enum kcsan_value_change value_change, int cpu_id,
+			 enum kcsan_value_change value_change,
 			 enum kcsan_report_type type);
 
 #endif /* _KERNEL_KCSAN_KCSAN_H */