linux-kernel - [tip: smp/core] xen/cpuhotplug: Replace cpu_up/down() with device

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Message-ID: <158513796179.28353.14375757880159397695.tip-bot2@tip-bot2>
Date:   Wed, 25 Mar 2020 12:06:01 -0000
From:   "tip-bot2 for Qais Yousef" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Qais Yousef <qais.yousef@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juergen Gross <jgross@...e.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: smp/core] xen/cpuhotplug: Replace cpu_up/down() with
 device_online/offline()

The following commit has been merged into the smp/core branch of tip:

Commit-ID:     a926f81d2f6c51458e116c5b3ff3af471b56098f
Gitweb:        https://git.kernel.org/tip/a926f81d2f6c51458e116c5b3ff3af471b56098f
Author:        Qais Yousef <qais.yousef@....com>
AuthorDate:    Mon, 23 Mar 2020 13:51:06 
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 25 Mar 2020 12:59:36 +01:00

xen/cpuhotplug: Replace cpu_up/down() with device_online/offline()

The core device API performs extra housekeeping bits that are missing
from directly calling cpu_up/down().

See commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and
serialization during LPM") for an example description of what might go
wrong.

This also prepares to make cpu_up/down() a private interface of the cpu
subsystem.

Signed-off-by: Qais Yousef <qais.yousef@....com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Juergen Gross <jgross@...e.com>
Link: https://lkml.kernel.org/r/20200323135110.30522-14-qais.yousef@arm.com

---
 drivers/xen/cpu_hotplug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c
index f192b6f..ec975de 100644
--- a/drivers/xen/cpu_hotplug.c
+++ b/drivers/xen/cpu_hotplug.c
@@ -94,7 +94,7 @@ static int setup_cpu_watcher(struct notifier_block *notifier,
 
 	for_each_possible_cpu(cpu) {
 		if (vcpu_online(cpu) == 0) {
-			(void)cpu_down(cpu);
+			device_offline(get_cpu_device(cpu));
 			set_cpu_present(cpu, false);
 		}
 	}