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From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: david.vrabel@citrix.com, konrad.wilk@oracle.com
Cc: xen-devel@lists.xenproject.org,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] xen/x86: Call cpu_startup_entry(CPUHP_AP_ONLINE_IDLE) from xen_play_dead()
Date: Thu, 17 Mar 2016 09:03:25 -0400	[thread overview]
Message-ID: <1458219805-13197-3-git-send-email-boris.ostrovsky__43816.9022476815$1458220012$gmane$org@oracle.com> (raw)
In-Reply-To: <1458219805-13197-1-git-send-email-boris.ostrovsky@oracle.com>

This call has always been missing from xen_play dead() but until
recently this was rather benign. With new cpu hotplug framework
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>
---
 arch/x86/xen/smp.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 3c6d17f..719cf29 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 */
-- 
1.7.1


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  parent reply	other threads:[~2016-03-17 13:05 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1458219805-13197-1-git-send-email-boris.ostrovsky@oracle.com>
2016-03-17 13:03 ` [PATCH 1/2] xen/apic: Provide Xen-specific version of cpu_present_to_apicid APIC op Boris Ostrovsky
2016-03-17 13:03 ` Boris Ostrovsky [this message]
     [not found] ` <1458219805-13197-2-git-send-email-boris.ostrovsky@oracle.com>
2016-03-25 14:52   ` Konrad Rzeszutek Wilk
     [not found] ` <1458219805-13197-3-git-send-email-boris.ostrovsky@oracle.com>
2016-03-25 14:53   ` [PATCH 2/2] xen/x86: Call cpu_startup_entry(CPUHP_AP_ONLINE_IDLE) from xen_play_dead() Konrad Rzeszutek Wilk
2016-03-25 15:08     ` Boris Ostrovsky
2016-03-25 15:45       ` Konrad Rzeszutek Wilk

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