[PATCH 07/45] CPU hotplug: Expose the new debug config option

[Srivatsa S. Bhat]

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 at linux-foundation.org>
Cc: "Paul E. McKenney" <paul.mckenney at linaro.org>
Cc: Akinobu Mita <akinobu.mita at gmail.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Michel Lespinasse <walken at google.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat at linux.vnet.ibm.com>
---

 lib/Kconfig.debug |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 566cf2b..6be1e72 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -512,6 +512,15 @@ 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
+	default n
+	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