[PATCH v2] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS_RT

[PATCH v2] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS_RT

[Waiman Long]

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@roeck-us.net>
Signed-off-by: Waiman Long <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 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

Re: [PATCH v2] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS_RT

[Guenter Roeck]

On 11/27/24 18:00, Waiman Long wrote:
> 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@roeck-us.net>
> Signed-off-by: Waiman Long <longman@redhat.com>

Tested-by: Guenter Roeck <linux@roeck-us.net>

> ---
>   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

[tip: locking/core] locking/lockdep: Enforce PROVE_RAW_LOCK_NESTING only if ARCH_SUPPORTS_RT

[tip-bot2 for Waiman Long]

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@redhat.com>
AuthorDate:    Wed, 27 Nov 2024 21:00:09 -05:00
Committer:     Peter Zijlstra <peterz@infradead.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@roeck-us.net>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Guenter Roeck <linux@roeck-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