netdev - [PATCH v6 45/46] CPU hotplug, stop_machine: Decouple CPU hotplug from stop

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Message-ID: <20130218124443.26245.34919.stgit@srivatsabhat.in.ibm.com>
Date:	Mon, 18 Feb 2013 18:14:43 +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
Cc:	rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
	xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
	fweisbec@...il.com, linux@....linux.org.uk,
	nikunj@...ux.vnet.ibm.com, srivatsa.bhat@...ux.vnet.ibm.com,
	linux-pm@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	walken@...gle.com, vincent.guittot@...aro.org
Subject: [PATCH v6 45/46] CPU hotplug,
 stop_machine: Decouple CPU hotplug from stop_machine() in Kconfig

Simply dropping HOTPLUG_CPU from the dependency list of STOP_MACHINE will
lead to the following kconfig issue, reported by Fengguang Wu:

"warning: (HAVE_TEXT_POKE_SMP) selects STOP_MACHINE which has unmet direct
dependencies (SMP && MODULE_UNLOAD)"

So drop HOTPLUG_CPU and add HAVE_TEXT_POKE_SMP to the dependency list of
STOP_MACHINE.

And while at it, also cleanup a comment that refers to CPU hotplug being
dependent on stop_machine().

Cc: David Howells <dhowells@...hat.com>
Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Suggested-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---

 include/linux/stop_machine.h |    2 +-
 init/Kconfig                 |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/stop_machine.h b/include/linux/stop_machine.h
index 3b5e910..ce2d3c4 100644
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@@ -120,7 +120,7 @@ int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
  * @cpus: the cpus to run the @fn() on (NULL = any online cpu)
  *
  * Description: This is a special version of the above, which assumes cpus
- * won't come or go while it's being called.  Used by hotplug cpu.
+ * won't come or go while it's being called.
  */
 int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
 
diff --git a/init/Kconfig b/init/Kconfig
index be8b7f5..f4f79af 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1711,7 +1711,7 @@ config INIT_ALL_POSSIBLE
 config STOP_MACHINE
 	bool
 	default y
-	depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
+	depends on (SMP && (MODULE_UNLOAD || HAVE_TEXT_POKE_SMP))
 	help
 	  Need stop_machine() primitive.
 

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