From: Kirill Tkhai <tkhai@yandex.ru>
Date: Thu, 12 Dec 2013 13:41:01 +0000 (+0400)
Subject: xtensa: Enable irqs after cpu is set online
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=abf0ea65e0adede5f40a836e6af7f62e7c850546;p=deliverable%2Flinux.git

xtensa: Enable irqs after cpu is set online

there is a small possibility that wake_up of softirq thread
happens between local_irq_enable() and set_cpu_online(). In
this case affinity of the thread changes to fallback affinity
(i.e. CPU0). This may be a source of problems.

The patch kills that possibility.

Signed-off-by: Kirill Tkhai <tkhai@yandex.ru>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---

diff --git a/arch/xtensa/kernel/smp.c b/arch/xtensa/kernel/smp.c
index 1c7a209795e8..aa8bd8717927 100644
--- a/arch/xtensa/kernel/smp.c
+++ b/arch/xtensa/kernel/smp.c
@@ -151,9 +151,10 @@ void secondary_start_kernel(void)
 	secondary_init_irq();
 	local_timer_setup(cpu);
 
+	set_cpu_online(cpu, true);
+
 	local_irq_enable();
 
-	set_cpu_online(cpu, true);
 	complete(&cpu_running);
 
 	cpu_startup_entry(CPUHP_ONLINE);