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

From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Russell King <linux@arm.linux.org.uk>,
	Wolfram Sang <wsa@the-dreams.de>,
	Catalin Marinas <catalin.marinas@arm.com>,
	linux-kernel@vger.kernel.org,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	xen-devel@lists.xenproject.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/6] ARM: xen: Register with kernel restart handler
Date: Fri, 8 Apr 2016 11:22:57 -0400	[thread overview]
Message-ID: <20160408152257.GJ15411@char.us.oracle.com> (raw)
In-Reply-To: <1460120039-2497-3-git-send-email-linux@roeck-us.net>

On Fri, Apr 08, 2016 at 05:53:55AM -0700, 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

Is there some macro for that magic value?

> are replaced if Xen is running.
> 
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
>  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
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

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