From: Will Deacon <will@kernel.org>
Date: Tue, 27 Aug 2019 14:54:56 +0000 (+0100)
Subject: arm64: smp: Treat unknown boot failures as being 'stuck in kernel'
X-Git-Tag: v5.15~5475^2~6^8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ebef746543fd1aa162216b0e484eb9062b65741d;p=platform%2Fkernel%2Flinux-starfive.git

arm64: smp: Treat unknown boot failures as being 'stuck in kernel'

When we fail to bring a secondary CPU online and it fails in an unknown
state, we should assume the worst and increment 'cpus_stuck_in_kernel'
so that things like kexec() are disabled.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
---

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 1f8aeb7..dc9fe87 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -147,6 +147,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
 		default:
 			pr_err("CPU%u: failed in unknown state : 0x%lx\n",
 					cpu, status);
+			cpus_stuck_in_kernel++;
 			break;
 		case CPU_KILL_ME:
 			if (!op_cpu_kill(cpu)) {