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From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
To: tglx@linutronix.de, peterz@infradead.org, tj@kernel.org,
	oleg@redhat.com, paulmck@linux.vnet.ibm.com,
	rusty@rustcorp.com.au, mingo@kernel.org,
	akpm@linux-foundation.org, namhyung@kernel.org,
	walken@google.com, vincent.guittot@linaro.org,
	laijs@cn.fujitsu.com
Cc: rostedt@goodmis.org, wangyun@linux.vnet.ibm.com,
	xiaoguangrong@linux.vnet.ibm.com, sbw@mit.edu,
	fweisbec@gmail.com, zhong@linux.vnet.ibm.com,
	nikunj@linux.vnet.ibm.com, srivatsa.bhat@linux.vnet.ibm.com,
	linux-pm@vger.kernel.org, linux-arch@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	"Paul E. McKenney" <paul.mckenney@linaro.org>,
	Akinobu Mita <akinobu.mita@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Michel Lespinasse <walken@google.com>
Subject: [PATCH 07/45] CPU hotplug: Expose the new debug config option
Date: Sun, 23 Jun 2013 19:09:31 +0530	[thread overview]
Message-ID: <20130623133928.19094.8259.stgit@srivatsabhat.in.ibm.com> (raw)
In-Reply-To: <20130623133642.19094.16038.stgit@srivatsabhat.in.ibm.com>

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" <paul.mckenney@linaro.org>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Michel Lespinasse <walken@google.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@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


  parent reply	other threads:[~2013-06-23 13:43 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-23 13:37 [PATCH 00/45] CPU hotplug: stop_machine()-free CPU hotplug, part 1 Srivatsa S. Bhat
2013-06-23 13:38 ` [PATCH 01/45] CPU hotplug: Provide APIs to prevent CPU offline from atomic context Srivatsa S. Bhat
2013-06-24 22:49   ` Steven Rostedt
2013-06-23 13:38 ` [PATCH 02/45] CPU hotplug: Clarify the usage of different synchronization APIs Srivatsa S. Bhat
2013-06-23 13:38 ` [PATCH 03/45] Documentation, CPU hotplug: Recommend usage of get/put_online_cpus_atomic() Srivatsa S. Bhat
2013-06-23 13:38 ` [PATCH 04/45] CPU hotplug: Add infrastructure to check lacking hotplug synchronization Srivatsa S. Bhat
2013-06-24 23:26   ` Steven Rostedt
2013-06-25 18:49     ` Srivatsa S. Bhat
2013-06-23 13:39 ` [PATCH 05/45] CPU hotplug: Protect set_cpu_online() to avoid false-positives Srivatsa S. Bhat
2013-06-23 13:39 ` [PATCH 06/45] CPU hotplug: Sprinkle debugging checks to catch locking bugs Srivatsa S. Bhat
2013-06-23 13:39 ` Srivatsa S. Bhat [this message]
2013-06-23 15:08   ` [PATCH 07/45] CPU hotplug: Expose the new debug config option Sergei Shtylyov
2013-06-23 18:58     ` Srivatsa S. Bhat
2013-06-23 13:39 ` [PATCH 08/45] CPU hotplug: Convert preprocessor macros to static inline functions Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 09/45] smp: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 10/45] sched/core: " Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 11/45] migration: Use raw_spin_lock/unlock since interrupts are already disabled Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 12/45] sched/fair: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:40 ` [PATCH 13/45] timer: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 14/45] sched/rt: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 15/45] rcu: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 16/45] tick-broadcast: " Srivatsa S. Bhat
2013-06-23 13:41 ` [PATCH 17/45] time/clocksource: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 18/45] softirq: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 19/45] irq: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 20/45] net: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 21/45] block: " Srivatsa S. Bhat
2013-06-23 13:42 ` [PATCH 22/45] percpu_counter: " Srivatsa S. Bhat
2013-06-24 17:55   ` Tejun Heo
2013-06-24 18:06     ` Tejun Heo
2013-06-24 18:09       ` Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 23/45] infiniband: ehca: " Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 24/45] [SCSI] fcoe: " Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 25/45] staging/octeon: " Srivatsa S. Bhat
2013-06-23 18:17   ` Greg Kroah-Hartman
2013-06-23 18:55     ` Srivatsa S. Bhat
2013-06-23 19:17       ` Joe Perches
2013-06-24 17:25         ` Srivatsa S. Bhat
2013-06-24 18:17       ` David Daney
2013-06-23 13:43 ` [PATCH 26/45] x86: " Srivatsa S. Bhat
2013-06-23 13:43 ` [PATCH 27/45] perf/x86: " Srivatsa S. Bhat
2013-06-23 13:44 ` [PATCH 28/45] KVM: " Srivatsa S. Bhat
2013-06-23 13:44 ` [PATCH 29/45] kvm/vmx: " Srivatsa S. Bhat
2013-06-23 13:44 ` [PATCH 30/45] x86/xen: " Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 31/45] alpha/smp: " Srivatsa S. Bhat
2013-06-23 17:50   ` Matt Turner
2013-06-23 18:56     ` Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 32/45] blackfin/smp: " Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 33/45] cris/smp: " Srivatsa S. Bhat
2013-06-24  6:41   ` Jesper Nilsson
2013-06-23 13:45 ` [PATCH 34/45] hexagon/smp: " Srivatsa S. Bhat
2013-06-23 13:45 ` [PATCH 35/45] ia64: irq, perfmon: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 36/45] ia64: smp, tlb: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 37/45] m32r: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 38/45] MIPS: " Srivatsa S. Bhat
2013-06-23 13:46 ` [PATCH 39/45] mn10300: " Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 40/45] powerpc, irq: Use GFP_ATOMIC allocations in atomic context Srivatsa S. Bhat
2013-06-25  2:08   ` Michael Ellerman
2013-06-25  2:13     ` Benjamin Herrenschmidt
2013-06-25  2:58       ` Michael Ellerman
2013-06-25  3:13         ` Benjamin Herrenschmidt
2013-06-25 19:20           ` Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 41/45] powerpc: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 42/45] powerpc: Use get/put_online_cpus_atomic() to avoid false-positive warning Srivatsa S. Bhat
2013-06-23 13:47 ` [PATCH 43/45] sh: Use get/put_online_cpus_atomic() to prevent CPU offline Srivatsa S. Bhat
2013-06-23 13:48 ` [PATCH 44/45] sparc: " Srivatsa S. Bhat
2013-06-23 13:48 ` [PATCH 45/45] tile: " Srivatsa S. Bhat

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