linux-kernel - [PATCH 2/2] locking/rwsem: Make DEBUG_RWSEMS and PREEMPT

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Message-Id: <20231216013656.1382213-2-longman@redhat.com>
Date: Fri, 15 Dec 2023 20:36:56 -0500
From: Waiman Long <longman@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Will Deacon <will@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org,
	George Stark <gnstark@...utedevices.com>,
	Waiman Long <longman@...hat.com>
Subject: [PATCH 2/2] locking/rwsem: Make DEBUG_RWSEMS and PREEMPT_RT mutually exclusive

The debugging code enabled by CONFIG_DEBUG_RWSEMS 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>
---
 lib/Kconfig.debug | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index cc7d53d9dc01..2a95caa7e122 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1297,7 +1297,7 @@ 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
@@ -1420,7 +1420,7 @@ 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.
-- 
2.39.3