linux-kernel - [PATCH v2] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS

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Message-ID: <20241128020009.83347-1-longman@redhat.com>
Date: Wed, 27 Nov 2024 21:00:09 -0500
From: Waiman Long <longman@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Boqun Feng <boqun.feng@...il.com>
Cc: linux-kernel@...r.kernel.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Waiman Long <longman@...hat.com>
Subject: [PATCH v2] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS_RT

Relax the rule to set PROVE_RAW_LOCK_NESTING by default only for arches
that supports PREEMPT_RT.  For arches that do not support PREEMPT_RT,
they will not be forced to address unimportant raw lock nesting issues
when they want to enable PROVE_LOCKING.  They do have the option
to enable it to look for these raw locking nesting problems if they
choose to.

Suggested-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Waiman Long <longman@...hat.com>
---
 lib/Kconfig.debug | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1e37c62e8595..942b4cb138bd 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1397,9 +1397,9 @@ config PROVE_LOCKING
 	 For more details, see Documentation/locking/lockdep-design.rst.
 
 config PROVE_RAW_LOCK_NESTING
-	bool
+	bool "Enable raw_spinlock - spinlock nesting checks" if !ARCH_SUPPORTS_RT
 	depends on PROVE_LOCKING
-	default y
+	default y if ARCH_SUPPORTS_RT
 	help
 	 Enable the raw_spinlock vs. spinlock nesting checks which ensure
 	 that the lock nesting rules for PREEMPT_RT enabled kernels are
-- 
2.47.0