[Xen-devel] [PATCH v3 11/15] driver: xen: Replace cpu_up/down with device_online/offline

[Qais Yousef <qais.yousef@xxxxxxx>]

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 for anything
but the cpu subsystem.

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Qais Yousef <qais.yousef@xxxxxxx>
CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
CC: Juergen Gross <jgross@xxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: xen-devel@xxxxxxxxxxxxxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx
---

Juergen, there's a new add_cpu() which you should be CCed on. I wasn't sure if
I could safely convert this to use it since I couldn't find whether the
notifier already hold the lock or not. If you think remove_cpu() is safe, let
me know and I can send an updated patch.

 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 f192b6f42da9..ec975decb5de 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);
                }
        }
-- 
2.17.1


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