linux-kernel - [tip:smp/hotplug] sh/SH-X3 SMP: Convert to hotplug state machine

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Message-ID: <tip-515332336be71d014bca1d29369c5d72baa38f71@git.kernel.org>
Date:   Mon, 19 Sep 2016 12:53:46 -0700
From:   tip-bot for Sebastian Andrzej Siewior <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, peterz@...radead.org, bigeasy@...utronix.de,
        tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip:smp/hotplug] sh/SH-X3 SMP: Convert to hotplug state machine

Commit-ID:  515332336be71d014bca1d29369c5d72baa38f71
Gitweb:     http://git.kernel.org/tip/515332336be71d014bca1d29369c5d72baa38f71
Author:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
AuthorDate: Tue, 6 Sep 2016 19:04:41 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 19 Sep 2016 21:44:27 +0200

sh/SH-X3 SMP: Convert to hotplug state machine

Install the callbacks via the state machine.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: linux-sh@...r.kernel.org
Cc: rt@...utronix.de
Link: http://lkml.kernel.org/r/20160906170457.32393-6-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/sh/kernel/cpu/sh4a/smp-shx3.c | 26 +++++---------------------
 include/linux/cpuhotplug.h         |  1 +
 2 files changed, 6 insertions(+), 21 deletions(-)

diff --git a/arch/sh/kernel/cpu/sh4a/smp-shx3.c b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
index 839612c..0d3637c 100644
--- a/arch/sh/kernel/cpu/sh4a/smp-shx3.c
+++ b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
@@ -122,32 +122,16 @@ static void shx3_update_boot_vector(unsigned int cpu)
 	__raw_writel(STBCR_RESET, STBCR_REG(cpu));
 }
 
-static int
-shx3_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+static int shx3_cpu_prepare(unsigned int cpu)
 {
-	unsigned int cpu = (unsigned int)hcpu;
-
-	switch (action) {
-	case CPU_UP_PREPARE:
-		shx3_update_boot_vector(cpu);
-		break;
-	case CPU_ONLINE:
-		pr_info("CPU %u is now online\n", cpu);
-		break;
-	case CPU_DEAD:
-		break;
-	}
-
-	return NOTIFY_OK;
+	shx3_update_boot_vector(cpu);
+	return 0;
 }
 
-static struct notifier_block shx3_cpu_notifier = {
-	.notifier_call		= shx3_cpu_callback,
-};
-
 static int register_shx3_cpu_notifier(void)
 {
-	register_hotcpu_notifier(&shx3_cpu_notifier);
+	cpuhp_setup_state_nocalls(CPUHP_SH_SH3X_PREPARE, "sh/shx3:prepare",
+				  shx3_cpu_prepare, NULL);
 	return 0;
 }
 late_initcall(register_shx3_cpu_notifier);
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 35859aa..8dec2a2 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -37,6 +37,7 @@ enum cpuhp_state {
 	CPUHP_POWERPC_MMU_CTX_PREPARE,
 	CPUHP_NOTIFY_PREPARE,
 	CPUHP_ARM_SHMOBILE_SCU_PREPARE,
+	CPUHP_SH_SH3X_PREPARE,
 	CPUHP_TIMERS_DEAD,
 	CPUHP_BRINGUP_CPU,
 	CPUHP_AP_IDLE_DEAD,