linux-kernel - [PATCH tip/core/rcu 05/10] kcsan: Fold panic() call into print

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Date:   Tue, 11 May 2021 16:23:56 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        kernel-team@...com, mingo@...nel.org
Cc:     elver@...gle.com, andreyknvl@...gle.com, glider@...gle.com,
        dvyukov@...gle.com, cai@....pw, boqun.feng@...il.com,
        Mark Rutland <mark.rutland@....com>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH tip/core/rcu 05/10] kcsan: Fold panic() call into print_report()

From: Mark Rutland <mark.rutland@....com>

So that we can add more callers of print_report(), lets fold the panic()
call into print_report() so the caller doesn't have to handle this
explicitly.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/kcsan/report.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c
index 88225f6d471e..8bfa970965a1 100644
--- a/kernel/kcsan/report.c
+++ b/kernel/kcsan/report.c
@@ -325,10 +325,7 @@ static void print_verbose_info(struct task_struct *task)
 	print_irqtrace_events(task);
 }
 
-/*
- * Returns true if a report was generated, false otherwise.
- */
-static bool print_report(enum kcsan_value_change value_change,
+static void print_report(enum kcsan_value_change value_change,
 			 enum kcsan_report_type type,
 			 const struct access_info *ai,
 			 const struct other_info *other_info)
@@ -344,7 +341,7 @@ static bool print_report(enum kcsan_value_change value_change,
 	 * Must check report filter rules before starting to print.
 	 */
 	if (skip_report(KCSAN_VALUE_CHANGE_TRUE, stack_entries[skipnr]))
-		return false;
+		return;
 
 	if (type == KCSAN_REPORT_RACE_SIGNAL) {
 		other_skipnr = get_stack_skipnr(other_info->stack_entries,
@@ -353,11 +350,11 @@ static bool print_report(enum kcsan_value_change value_change,
 
 		/* @value_change is only known for the other thread */
 		if (skip_report(value_change, other_frame))
-			return false;
+			return;
 	}
 
 	if (rate_limit_report(this_frame, other_frame))
-		return false;
+		return;
 
 	/* Print report header. */
 	pr_err("==================================================================\n");
@@ -431,7 +428,8 @@ static bool print_report(enum kcsan_value_change value_change,
 	dump_stack_print_info(KERN_DEFAULT);
 	pr_err("==================================================================\n");
 
-	return true;
+	if (panic_on_warn)
+		panic("panic_on_warn set ...\n");
 }
 
 static void release_report(unsigned long *flags, struct other_info *other_info)
@@ -628,11 +626,8 @@ static void kcsan_report(const volatile void *ptr, size_t size, int access_type,
 		 * either TRUE or MAYBE. In case of MAYBE, further filtering may
 		 * be done once we know the full stack trace in print_report().
 		 */
-		bool reported = value_change != KCSAN_VALUE_CHANGE_FALSE &&
-				print_report(value_change, type, &ai, other_info);
-
-		if (reported && panic_on_warn)
-			panic("panic_on_warn set ...\n");
+		if (value_change != KCSAN_VALUE_CHANGE_FALSE)
+			print_report(value_change, type, &ai, other_info);
 
 		release_report(&flags, other_info);
 	}
-- 
2.31.1.189.g2e36527f23