linux-kernel - [tip:smp/hotplug] arm64/cpuinfo: Make hotplug notifier symmetric

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Message-ID: <tip-914fb85f01571233af199a78ed1f88d9268421fd@git.kernel.org>
Date:   Thu, 1 Dec 2016 16:14:53 -0800
From:   tip-bot for Anna-Maria Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, anna-maria@...utronix.de,
        catalin.marinas@....com, tglx@...utronix.de, bigeasy@...utronix.de,
        will.deacon@....com, hpa@...or.com, suzuki.poulose@....com,
        mingo@...nel.org
Subject: [tip:smp/hotplug] arm64/cpuinfo: Make hotplug notifier symmetric

Commit-ID:  914fb85f01571233af199a78ed1f88d9268421fd
Gitweb:     http://git.kernel.org/tip/914fb85f01571233af199a78ed1f88d9268421fd
Author:     Anna-Maria Gleixner <anna-maria@...utronix.de>
AuthorDate: Sun, 27 Nov 2016 00:13:43 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 2 Dec 2016 00:52:37 +0100

arm64/cpuinfo: Make hotplug notifier symmetric

There is no requirement to keep the sysfs files around until the CPU is
completely dead. Remove them during the DOWN_PREPARE notification. This is
a preparatory patch for converting to the hotplug state machine.

Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: rt@...utronix.de
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/20161126231350.10321-16-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 arch/arm64/kernel/cpuinfo.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c
index b3d5b3e..19aad70 100644
--- a/arch/arm64/kernel/cpuinfo.c
+++ b/arch/arm64/kernel/cpuinfo.c
@@ -272,9 +272,10 @@ static int cpuid_callback(struct notifier_block *nb,
 
 	switch (action & ~CPU_TASKS_FROZEN) {
 	case CPU_ONLINE:
+	case CPU_DOWN_FAILED:
 		rc = cpuid_add_regs(cpu);
 		break;
-	case CPU_DEAD:
+	case CPU_DOWN_PREPARE:
 		rc = cpuid_remove_regs(cpu);
 		break;
 	}