From: Hosung Kim <hosung0.kim@samsung.com>
Date: Tue, 11 Apr 2017 10:12:30 +0000 (+0900)
Subject: [COMMON] arm64: smp: recall to print other cpu information
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8da2da0e69de43700be35a0bf8f85dd0f6a2c804;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[COMMON] arm64: smp: recall to print other cpu information

This commit reverts following commits it is already merged.
arm64: Reduce verbosity on SMP CPU stop by Jab Glauber.

In mobile, this information is very important to debug.

Change-Id: I1ca149608d70903675b7ff0a98c206e339b45e1e
Signed-off-by: Hosung Kim <hosung0.kim@samsung.com>
---

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 6a8dc4d33f2e..f1cf3634ade7 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -832,11 +832,21 @@ void arch_irq_work_raise(void)
 }
 #endif
 
+static DEFINE_RAW_SPINLOCK(stop_lock);
+
 /*
  * ipi_cpu_stop - handle IPI from smp_send_stop()
  */
 static void ipi_cpu_stop(unsigned int cpu, struct pt_regs *regs)
 {
+	if (system_state == SYSTEM_BOOTING ||
+	    system_state == SYSTEM_RUNNING) {
+		raw_spin_lock(&stop_lock);
+		pr_crit("CPU%u: stopping\n", cpu);
+		dump_stack();
+		raw_spin_unlock(&stop_lock);
+	}
+
 	set_cpu_online(cpu, false);
 
 	local_irq_disable();