From dc6416f1d711eb4c1726e845d653235dcaae12e1 Mon Sep 17 00:00:00 2001
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Date: Thu, 17 Mar 2016 09:03:25 -0400
Subject: [PATCH] xen/x86: Call cpu_startup_entry(CPUHP_AP_ONLINE_IDLE) from
xen_play_dead()
This call has always been missing from xen_play dead() but until
recently this was rather benign. With new cpu hotplug framework
(commit 8df3e07e7f21 ("cpu/hotplug: Let upcoming cpu bring itself fully up").
however this call is required, otherwise a hot-plugged CPU will not
be properly brough up (by never calling cpuhp_online_idle())
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
arch/x86/xen/smp.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 3c6d17fd423a8..719cf291dcdf1 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -545,6 +545,8 @@ static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
* data back is to call:
*/
tick_nohz_idle_enter();
+
+ cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
#else /* !CONFIG_HOTPLUG_CPU */
--
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