linux-kernel - [PATCH] Revert "kernel/stop_machine.c: remove CONFIG

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Date:	Fri, 18 Dec 2015 15:35:55 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH] Revert "kernel/stop_machine.c: remove CONFIG_SMP dependencies"

This reverts commit 64dab25b058c12f935794cb239089303bda7dbc1.

CONFIG_SMP dependency is needed for some arch like tile, tilegx and
m32r. They use stop_machine() but they donot have HOTPLUG_CPU and as a
result their builds are failing with "undefined symbol 'stop_machine'".

Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---

tile build at:
https://travis-ci.org/sudipm-mukherjee/parport/jobs/97618549

tilegx build at:
https://travis-ci.org/sudipm-mukherjee/parport/jobs/97618550

m32r build at:
https://travis-ci.org/sudipm-mukherjee/parport/jobs/97618542

 kernel/stop_machine.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index b07adef..edb6de4 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -529,7 +529,7 @@ static int __init cpu_stop_init(void)
 }
 early_initcall(cpu_stop_init);
 
-#ifdef CONFIG_HOTPLUG_CPU
+#if defined(CONFIG_SMP) || defined(CONFIG_HOTPLUG_CPU)
 
 static int __stop_machine(cpu_stop_fn_t fn, void *data, const struct cpumask *cpus)
 {
@@ -629,4 +629,4 @@ int stop_machine_from_inactive_cpu(cpu_stop_fn_t fn, void *data,
 	return ret ?: done.ret;
 }
 
-#endif	/* CONFIG_HOTPLUG_CPU */
+#endif	/* CONFIG_SMP || CONFIG_HOTPLUG_CPU */
-- 
1.9.1

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