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

[PATCH v3 00/45] CPU hotplug: stop_machine()-free CPU hotplug, part 1 · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 01/45] CPU hotplug: Provide APIs to prevent CPU offline from atomic context · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 02/45] CPU hotplug: Clarify the usage of different synchronization APIs · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 03/45] Documentation, CPU hotplug: Recommend usage of get/put_online_cpus_atomic() · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 04/45] CPU hotplug: Add infrastructure to check lacking hotplug synchronization · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 05/45] CPU hotplug: Protect set_cpu_online() to avoid false-positives · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 06/45] CPU hotplug: Sprinkle debugging checks to catch locking bugs · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 07/45] CPU hotplug: Add _nocheck() variants of accessor functions · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 08/45] CPU hotplug: Expose the new debug config option · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 09/45] CPU hotplug: Convert preprocessor macros to static inline functions · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 10/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
Re: [PATCH v3 10/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Michael Wang <hidden> · 2013-07-02
Re: [PATCH v3 10/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-07-02
Re: [PATCH v3 10/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Michael Wang <hidden> · 2013-07-02
Re: [PATCH v3 10/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-07-02
Re: [PATCH v3 10/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Michael Wang <hidden> · 2013-07-02
[PATCH v3 11/45] sched/core: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 12/45] migration: Use raw_spin_lock/unlock since interrupts are already disabled · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 13/45] sched/fair: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 14/45] timer: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 15/45] sched/rt: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 16/45] rcu: Use cpu_is_offline_nocheck() to avoid false-positive warnings · Srivatsa S. Bhat <hidden> · 2013-06-27
Re: [PATCH v3 16/45] rcu: Use cpu_is_offline_nocheck() to avoid false-positive warnings · Paul E. McKenney <hidden> · 2013-06-27
[PATCH v3 17/45] tick-broadcast: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 18/45] time/clocksource: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 19/45] softirq: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 20/45] irq: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 21/45] net: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 22/45] block: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 23/45] percpu_counter: Use _nocheck version of for_each_online_cpu() · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 24/45] infiniband: ehca: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 25/45] [SCSI] fcoe: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 27/45] x86: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 26/45] staging/octeon: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 29/45] KVM: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 30/45] x86/xen: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 31/45] alpha/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 32/45] blackfin/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 33/45] cris/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 34/45] hexagon/smp: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 35/45] ia64: irq, perfmon: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 36/45] ia64: smp, tlb: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 37/45] m32r: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 38/45] MIPS: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 39/45] mn10300: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 40/45] powerpc, irq: Use GFP_ATOMIC allocations in atomic context · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 41/45] powerpc: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 42/45] powerpc: Use get/put_online_cpus_atomic() to avoid false-positive warning · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 43/45] sh: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 44/45] sparc: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 45/45] tile: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27
[PATCH v3 28/45] perf/x86: Use get/put_online_cpus_atomic() to prevent CPU offline · Srivatsa S. Bhat <hidden> · 2013-06-27

From: Srivatsa S. Bhat <hidden>
Date: 2013-06-27 19:57:33
Also in: linux-arch, linux-pm, lkml, netdev
Subsystem: library code, the rest · Maintainers: Andrew Morton, Linus Torvalds

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@linux-foundation.org>
Cc: "Paul E. McKenney" <redacted>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Michel Lespinasse <redacted>
Cc: Sergei Shtylyov <redacted>
Signed-off-by: Srivatsa S. Bhat <redacted>
---

 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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