linux-kernel - [tip: locking/core] locking/rwsem: Make DEBUG_RWSEMS and PREEMPT

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Date: Wed, 28 Feb 2024 12:53:21 -0000
From: "tip-bot2 for Waiman Long" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Waiman Long <longman@...hat.com>, Ingo Molnar <mingo@...nel.org>,
 Boqun Feng <boqun.feng@...il.com>, Thomas Gleixner <tglx@...utronix.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/rwsem: Make DEBUG_RWSEMS and PREEMPT_RT
 mutually exclusive

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

Commit-ID:     f22f71322a18e90e127f2fc2c11cc2d5191bc4c6
Gitweb:        https://git.kernel.org/tip/f22f71322a18e90e127f2fc2c11cc2d5191bc4c6
Author:        Waiman Long <longman@...hat.com>
AuthorDate:    Thu, 22 Feb 2024 10:05:40 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 28 Feb 2024 13:08:38 +01:00

locking/rwsem: Make DEBUG_RWSEMS and PREEMPT_RT mutually exclusive

The debugging code enabled by CONFIG_DEBUG_RWSEMS=y will only be
compiled in when CONFIG_PREEMPT_RT isn't set. There is no point to
allow CONFIG_DEBUG_RWSEMS to be set in a kernel configuration where
CONFIG_PREEMPT_RT is also set. Make them mutually exclusive.

Signed-off-by: Waiman Long <longman@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Boqun Feng <boqun.feng@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20240222150540.79981-5-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 975a07f..cb695bc 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1303,7 +1303,7 @@ config PROVE_LOCKING
 	select DEBUG_SPINLOCK
 	select DEBUG_MUTEXES if !PREEMPT_RT
 	select DEBUG_RT_MUTEXES if RT_MUTEXES
-	select DEBUG_RWSEMS
+	select DEBUG_RWSEMS if !PREEMPT_RT
 	select DEBUG_WW_MUTEX_SLOWPATH
 	select DEBUG_LOCK_ALLOC
 	select PREEMPT_COUNT if !ARCH_NO_PREEMPT
@@ -1426,7 +1426,7 @@ config DEBUG_WW_MUTEX_SLOWPATH
 
 config DEBUG_RWSEMS
 	bool "RW Semaphore debugging: basic checks"
-	depends on DEBUG_KERNEL
+	depends on DEBUG_KERNEL && !PREEMPT_RT
 	help
 	  This debugging feature allows mismatched rw semaphore locks
 	  and unlocks to be detected and reported.