From: Vijay Kumar <vijay.ac.kumar@oracle.com>
Date: Wed, 1 Feb 2017 19:34:37 +0000 (-0800)
Subject: sparc64: Set cpu state to offline when stopped
X-Git-Tag: v4.1.12-104.0.20170618_1145~121
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=c3ae4d9c6016273d6d3da4efc501bbf16a4da2b0;p=users%2Fjedix%2Flinux-maple.git

sparc64: Set cpu state to offline when stopped

CPU needs to be marked offline before stopping it. When not marked
offline, the xcall receives HV_EWOULDBLOCK and so assumes that not all
CPUs received the message, and retries. After 10000 retries, it finally
fails with fatal mondo timeout.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit cffb3e76818fee4763a2ce5f2b1eca2d7885e2cf)

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>

Orabug: 24297427
---

diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index 3210a3db13cd..e846288e2a3b 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1535,6 +1535,7 @@ void __irq_entry smp_receive_signal_client(int irq, struct pt_regs *regs)
 
 static void stop_this_cpu(void *dummy)
 {
+	set_cpu_online(smp_processor_id(), false);
 	prom_stopself();
 }
 
@@ -1546,6 +1547,8 @@ void smp_send_stop(void)
 		for_each_online_cpu(cpu) {
 			if (cpu == smp_processor_id())
 				continue;
+
+			set_cpu_online(cpu, false);
 #ifdef CONFIG_SUN_LDOMS
 			if (ldom_domaining_enabled) {
 				unsigned long hv_err;