linux-kernel - [PATCH 1/6] locking/selftests: More granular debug_locks

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Date:   Thu, 10 Dec 2020 15:42:55 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, will@...nel.org, boqun.feng@...il.com
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        bigeasy@...utronix.de, peterz@...radead.org
Subject: [PATCH 1/6] locking/selftests: More granular debug_locks_verbose

Showing all tests all the time is tiresome.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 Documentation/admin-guide/kernel-parameters.txt |   11 ++++++-----
 lib/locking-selftest.c                          |    5 +++--
 2 files changed, 9 insertions(+), 7 deletions(-)

--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -802,13 +802,14 @@
 			insecure, please do not use on production kernels.
 
 	debug_locks_verbose=
-			[KNL] verbose self-tests
-			Format=<0|1>
+			[KNL] verbose locking self-tests
+			Format: <int>
 			Print debugging info while doing the locking API
 			self-tests.
-			We default to 0 (no extra messages), setting it to
-			1 will print _a lot_ more information - normally
-			only useful to kernel developers.
+			Bitmask for the various LOCKTYPE_ tests. Defaults to 0
+			(no extra messages), setting it to -1 (all bits set)
+			will print _a_lot_ more information - normally only
+			useful to lockdep developers.
 
 	debug_objects	[KNL] Enable object debugging
 
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -1390,6 +1390,8 @@ static void dotest(void (*testcase_fn)(v
 
 	WARN_ON(irqs_disabled());
 
+	debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
+
 	testcase_fn();
 	/*
 	 * Filter out expected failures:
@@ -1410,7 +1412,7 @@ static void dotest(void (*testcase_fn)(v
 	}
 	testcase_total++;
 
-	if (debug_locks_verbose)
+	if (debug_locks_verbose & lockclass_mask)
 		pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
 			lockclass_mask, debug_locks, expected);
 	/*
@@ -2630,7 +2632,6 @@ void locking_selftest(void)
 	printk("  --------------------------------------------------------------------------\n");
 
 	init_shared_classes();
-	debug_locks_silent = !debug_locks_verbose;
 	lockdep_set_selftest_task(current);
 
 	DO_TESTCASE_6R("A-A deadlock", AA);