linux-kernel - Re: [PATCH v2 2/6] ARM: xen: Register with kernel restart handler

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Date:	Fri, 15 Apr 2016 14:10:02 -0700 (PDT)
From:	Stefano Stabellini <sstabellini@...nel.org>
To:	Guenter Roeck <linux@...ck-us.net>
cc:	Stefano Stabellini <sstabellini@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v2 2/6] ARM: xen: Register with kernel restart handler

On Fri, 15 Apr 2016, Guenter Roeck wrote:
> On Fri, Apr 15, 2016 at 11:22:36AM -0700, Stefano Stabellini wrote:
> > On Thu, 14 Apr 2016, Guenter Roeck wrote:
> > > Register with kernel restart handler instead of setting arm_pm_restart
> > > directly.
> > > 
> > > Select a high priority of 192 to ensure that default restart handlers
> > > are replaced if Xen is running.
> > > 
> > > Acked-by: Arnd Bergmann <arnd@...db.de>
> > > Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> > > Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > 
> > Thanks. I assume this is going to go in via Russell or Catalin's tree
> > with the rest of your series?
> > 
> I would suggest Russell, if he is willing to pick it up, since it mostly
> affects arm.

I am happy with that. In that case I'll remove this patch from my queue
not to have duplicates.


> 
> > 
> > > v2: Rebased to v4.6-rc3, added Reviewed/by/Acked-by tags
> > > 
> > >  arch/arm/xen/enlighten.c | 13 +++++++++++--
> > >  1 file changed, 11 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> > > index 75cd7345c654..76a1d12fd27e 100644
> > > --- a/arch/arm/xen/enlighten.c
> > > +++ b/arch/arm/xen/enlighten.c
> > > @@ -27,6 +27,7 @@
> > >  #include <linux/cpu.h>
> > >  #include <linux/console.h>
> > >  #include <linux/pvclock_gtod.h>
> > > +#include <linux/reboot.h>
> > >  #include <linux/time64.h>
> > >  #include <linux/timekeeping.h>
> > >  #include <linux/timekeeper_internal.h>
> > > @@ -193,14 +194,22 @@ after_register_vcpu_info:
> > >  	put_cpu();
> > >  }
> > >  
> > > -static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
> > > +static int xen_restart(struct notifier_block *nb, unsigned long action,
> > > +		       void *data)
> > >  {
> > >  	struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
> > >  	int rc;
> > >  	rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
> > >  	BUG_ON(rc);
> > > +
> > > +	return NOTIFY_DONE;
> > >  }
> > >  
> > > +static struct notifier_block xen_restart_nb = {
> > > +	.notifier_call = xen_restart,
> > > +	.priority = 192,
> > > +};
> > > +
> > >  static void xen_power_off(void)
> > >  {
> > >  	struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
> > > @@ -370,7 +379,7 @@ static int __init xen_pm_init(void)
> > >  		return -ENODEV;
> > >  
> > >  	pm_power_off = xen_power_off;
> > > -	arm_pm_restart = xen_restart;
> > > +	register_restart_handler(&xen_restart_nb);
> > >  	if (!xen_initial_domain()) {
> > >  		struct timespec64 ts;
> > >  		xen_read_wallclock(&ts);
> > > -- 
> > > 2.5.0
> > > 
>