linux-kernel - [PATCH 15/21] mips: octeon: smp: Convert to hotplug state machine

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Date:   Tue,  6 Sep 2016 19:04:51 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, rt@...utronix.de,
        tglx@...utronix.de,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org
Subject: [PATCH 15/21] mips: octeon: smp: Convert to hotplug state machine

Install the callbacks via the state machine.

Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 arch/mips/cavium-octeon/smp.c | 24 +++---------------------
 include/linux/cpuhotplug.h    |  1 +
 2 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/arch/mips/cavium-octeon/smp.c b/arch/mips/cavium-octeon/smp.c
index 4d457d602d3b..228c1cab2912 100644
--- a/arch/mips/cavium-octeon/smp.c
+++ b/arch/mips/cavium-octeon/smp.c
@@ -380,29 +380,11 @@ static int octeon_update_boot_vector(unsigned int cpu)
 	return 0;
 }
 
-static int octeon_cpu_callback(struct notifier_block *nfb,
-	unsigned long action, void *hcpu)
-{
-	unsigned int cpu = (unsigned long)hcpu;
-
-	switch (action & ~CPU_TASKS_FROZEN) {
-	case CPU_UP_PREPARE:
-		octeon_update_boot_vector(cpu);
-		break;
-	case CPU_ONLINE:
-		pr_info("Cpu %d online\n", cpu);
-		break;
-	case CPU_DEAD:
-		break;
-	}
-
-	return NOTIFY_OK;
-}
-
 static int register_cavium_notifier(void)
 {
-	hotcpu_notifier(octeon_cpu_callback, 0);
-	return 0;
+	return cpuhp_setup_state_nocalls(CPUHP_MIPS_CAVIUM_PREPARE,
+					 "mips/cavium:prepare",
+					 octeon_update_boot_vector, NULL);
 }
 late_initcall(register_cavium_notifier);
 
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 4cbf88c955d6..058d312fdf6f 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -44,6 +44,7 @@ enum cpuhp_state {
 	CPUHP_SH_SH3X_PREPARE,
 	CPUHP_X86_MICRCODE_PREPARE,
 	CPUHP_NOTF_ERR_INJ_PREPARE,
+	CPUHP_MIPS_CAVIUM_PREPARE,
 	CPUHP_TIMERS_DEAD,
 	CPUHP_BRINGUP_CPU,
 	CPUHP_AP_IDLE_DEAD,
-- 
2.9.3