linux-kernel - [tip: locking/core] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS

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Message-ID: <173313861411.412.6467281091993873078.tip-bot2@tip-bot2>
Date: Mon, 02 Dec 2024 11:23:34 -0000
From: "tip-bot2 for Waiman Long" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Guenter Roeck <linux@...ck-us.net>, Waiman Long <longman@...hat.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING
 only if ARCH_SUPPORTS_RT

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     d387ceb17149fed4d85a1ec01b3d65ae0204060d
Gitweb:        https://git.kernel.org/tip/d387ceb17149fed4d85a1ec01b3d65ae0204060d
Author:        Waiman Long <longman@...hat.com>
AuthorDate:    Wed, 27 Nov 2024 21:00:09 -05:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 02 Dec 2024 12:16:58 +01:00

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: Guenter Roeck <linux@...ck-us.net>
Link: https://lore.kernel.org/r/20241128020009.83347-1-longman@redhat.com
---
 lib/Kconfig.debug | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index f3d7237..49a3819 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