linux-kernel - [PATCH v3 1/3] locking/spinlock: Disable GENERIC_LOCKBREAK when DEBUG_LOCK

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Date:   Thu,  2 Feb 2017 09:15:27 -0500
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Waiman Long <longman@...hat.com>
Subject: [PATCH v3 1/3] locking/spinlock: Disable GENERIC_LOCKBREAK when DEBUG_LOCK_ALLOC is on

The break_lock variable defined when GENERIC_LOCKBREAK is on is used
only in kernel/locking/spinlock.c when

defined(CONFIG_GENERIC_LOCKBREAK) && !defined(CONFIG_DEBUG_LOCK_ALLOC).

As a result, there is no point in enabling GENERIC_LOCKBREAK to
define one more variable in the spinlock structure that is not going
to be used when DEBUG_LOCK_ALLOC is also on. This patch disables
GENERIC_LOCKBREAK under this circumstance.

Signed-off-by: Waiman Long <longman@...hat.com>
---
 arch/m32r/Kconfig    | 2 +-
 arch/parisc/Kconfig  | 2 +-
 arch/powerpc/Kconfig | 2 +-
 arch/s390/Kconfig    | 2 +-
 arch/sh/Kconfig      | 2 +-
 arch/sparc/Kconfig   | 2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index d227a69..c0922e0 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -242,7 +242,7 @@ config IRAM_SIZE
 config GENERIC_LOCKBREAK
 	bool
 	default y
-	depends on SMP && PREEMPT
+	depends on SMP && PREEMPT && !DEBUG_LOCK_ALLOC
 
 config RWSEM_GENERIC_SPINLOCK
 	bool
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 3a71f38..bd8dbb9 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -56,7 +56,7 @@ config STACK_GROWSUP
 config GENERIC_LOCKBREAK
 	bool
 	default y
-	depends on SMP && PREEMPT
+	depends on SMP && PREEMPT && !DEBUG_LOCK_ALLOC
 
 config RWSEM_GENERIC_SPINLOCK
 	def_bool y
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index a8ee573..feae0a3 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -60,7 +60,7 @@ config RWSEM_XCHGADD_ALGORITHM
 config GENERIC_LOCKBREAK
 	bool
 	default y
-	depends on SMP && PREEMPT
+	depends on SMP && PREEMPT && !DEBUG_LOCK_ALLOC
 
 config ARCH_HAS_ILOG2_U32
 	bool
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index c6722112..a2a33a6 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -38,7 +38,7 @@ config ARCH_DMA_ADDR_T_64BIT
 	def_bool y
 
 config GENERIC_LOCKBREAK
-	def_bool y if SMP && PREEMPT
+	def_bool y if SMP && PREEMPT && !DEBUG_LOCK_ALLOC
 
 config PGSTE
 	def_bool y if KVM
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index ee08695..e2eb35c 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -105,7 +105,7 @@ config GENERIC_CALIBRATE_DELAY
 
 config GENERIC_LOCKBREAK
 	def_bool y
-	depends on SMP && PREEMPT
+	depends on SMP && PREEMPT && !DEBUG_LOCK_ALLOC
 
 config ARCH_SUSPEND_POSSIBLE
 	def_bool n
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index cf4034c..695a31a 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -286,7 +286,7 @@ config US3_MC
 config GENERIC_LOCKBREAK
 	bool
 	default y
-	depends on SPARC64 && SMP && PREEMPT
+	depends on SPARC64 && SMP && PREEMPT && !DEBUG_LOCK_ALLOC
 
 config NUMA
 	bool "NUMA support"
-- 
1.8.3.1