linux-kernel - [PATCH 4.9 031/148] smp/hotplug: Move step CPUHP_AP_SMPCFD

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Date:   Tue, 12 Dec 2017 13:44:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lai Jiangshan <jiangshanlai@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Richard Weinberger <richard@....at>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [PATCH 4.9 031/148] smp/hotplug: Move step CPUHP_AP_SMPCFD_DYING to the correct place

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lai Jiangshan <jiangshanlai@...il.com>

commit 46febd37f9c758b05cd25feae8512f22584742fe upstream.

Commit 31487f8328f2 ("smp/cfd: Convert core to hotplug state machine")
accidently put this step on the wrong place. The step should be at the
cpuhp_ap_states[] rather than the cpuhp_bp_states[].

grep smpcfd /sys/devices/system/cpu/hotplug/states
 40: smpcfd:prepare
129: smpcfd:dying

"smpcfd:dying" was missing before.
So was the invocation of the function smpcfd_dying_cpu().

Fixes: 31487f8328f2 ("smp/cfd: Convert core to hotplug state machine")
Signed-off-by: Lai Jiangshan <jiangshanlai@...il.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Richard Weinberger <richard@....at>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Link: https://lkml.kernel.org/r/20171128131954.81229-1-jiangshanlai@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/cpu.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1321,11 +1321,6 @@ static struct cpuhp_step cpuhp_bp_states
 		.teardown.single	= NULL,
 		.cant_stop		= true,
 	},
-	[CPUHP_AP_SMPCFD_DYING] = {
-		.name			= "smpcfd:dying",
-		.startup.single		= NULL,
-		.teardown.single	= smpcfd_dying_cpu,
-	},
 	/*
 	 * Handled on controll processor until the plugged processor manages
 	 * this itself.
@@ -1367,6 +1362,11 @@ static struct cpuhp_step cpuhp_ap_states
 		.startup.single		= NULL,
 		.teardown.single	= rcutree_dying_cpu,
 	},
+	[CPUHP_AP_SMPCFD_DYING] = {
+		.name			= "smpcfd:dying",
+		.startup.single		= NULL,
+		.teardown.single	= smpcfd_dying_cpu,
+	},
 	/* Entry state on starting. Interrupts enabled from here on. Transient
 	 * state for synchronsization */
 	[CPUHP_AP_ONLINE] = {