Re: [Xen-devel] [PATCH 3/6] xen/hvm kexec: unregister memory/target watch in xen-balloon.c

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jul 26, 2011 at 01:52:12PM +0200, Olaf Hering wrote:
> Unregister the memory/target watch during kexec. The watche can not be

watche? watcher I think?

> re-registered in the kexec kernel because it is still seen as busy by
> xenstore.
> 
> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> 
> ---
>  drivers/xen/xen-balloon.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> Index: linux-3.0/drivers/xen/xen-balloon.c
> ===================================================================
> --- linux-3.0.orig/drivers/xen/xen-balloon.c
> +++ linux-3.0/drivers/xen/xen-balloon.c
> @@ -34,6 +34,7 @@
>  #include <linux/module.h>
>  #include <linux/sysdev.h>
>  #include <linux/capability.h>
> +#include <linux/syscore_ops.h>
>  
>  #include <xen/xen.h>
>  #include <xen/interface/xen.h>
> @@ -91,6 +92,15 @@ static struct notifier_block xenstore_no
>       .notifier_call = balloon_init_watcher,
>  };
>  
> +static void xen_balloon_shutdown_watcher(void)
> +{
> +     unregister_xenbus_watch(&target_watch);
> +}
> +
> +static struct syscore_ops xen_balloon_watcher_syscore_ops = {
> +     .shutdown = xen_balloon_shutdown_watcher,
> +};
> +
>  static int __init balloon_init(void)
>  {
>       if (!xen_domain())
> @@ -100,6 +110,7 @@ static int __init balloon_init(void)
>  
>       register_balloon(&balloon_sysdev);
>       register_xenstore_notifier(&xenstore_notifier);
> +     register_syscore_ops(&xen_balloon_watcher_syscore_ops);
>  
>       return 0;
>  }
> 
> 
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