From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 19 Mar 2016 10:47:39 +0000 (+0100)
Subject: x86/apic/uv: Fix the hotplug notifier
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f47ab81aca8264adae25005f0130db60c0af7797;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

x86/apic/uv: Fix the hotplug notifier

The notifier is missing the CPU_DOWN_FAILED transition. That leaves the
heartbeat disabled when CPU_DOWN_PREPARE fails.

It also does not handle the FROZEN transition variants. That might not be an
issue for UV, but it's inconsistent.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Dimitri Sivanich <sivanich@sgi.com>
---

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 278070381aee..8f4942e2bcbb 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -792,7 +792,8 @@ static int uv_scir_cpu_notify(struct notifier_block *self, unsigned long action,
 {
 	long cpu = (long)hcpu;
 
-	switch (action) {
+	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_DOWN_FAILED:
 	case CPU_ONLINE:
 		uv_heartbeat_enable(cpu);
 		break;