linux-kernel - [PATCH v3 08/45] CPU hotplug: Expose the new debug config option

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Message-ID: <20130627195358.29830.48847.stgit@srivatsabhat.in.ibm.com>
Date:	Fri, 28 Jun 2013 01:23:58 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, akpm@...ux-foundation.org, namhyung@...nel.org,
	walken@...gle.com, vincent.guittot@...aro.org,
	laijs@...fujitsu.com, David.Laight@...lab.com
Cc:	rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
	xiaoguangrong@...ux.vnet.ibm.com, sbw@....edu, fweisbec@...il.com,
	zhong@...ux.vnet.ibm.com, nikunj@...ux.vnet.ibm.com,
	srivatsa.bhat@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Michel Lespinasse <walken@...gle.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH v3 08/45] CPU hotplug: Expose the new debug config option

Now that we have all the pieces of the CPU hotplug debug infrastructure
in place, expose the feature by growing a new Kconfig option,
CONFIG_DEBUG_HOTPLUG_CPU.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Paul E. McKenney" <paul.mckenney@...aro.org>
Cc: Akinobu Mita <akinobu.mita@...il.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Michel Lespinasse <walken@...gle.com>
Cc: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 lib/Kconfig.debug |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7154f79..42e17f0 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -512,6 +512,14 @@ config DEBUG_PREEMPT
 	  if kernel code uses it in a preemption-unsafe way. Also, the kernel
 	  will detect preemption count underflows.
 
+config DEBUG_HOTPLUG_CPU
+	bool "Debug CPU hotplug"
+	depends on HOTPLUG_CPU
+	help
+	  If you say Y here, the kernel will check all the accesses of
+	  cpu_online_mask from atomic contexts, and will print warnings if
+	  the task lacks appropriate synchronization with CPU hotplug.
+
 config DEBUG_RT_MUTEXES
 	bool "RT Mutex debugging, deadlock detection"
 	depends on DEBUG_KERNEL && RT_MUTEXES

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