linux-kernel - Re: [RFC/PATCH 1/5] context tracking: conditionalize guest support based on CONFIG

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Message-ID: <20130222132750.GE17948@somewhere.redhat.com>
Date:	Fri, 22 Feb 2013 14:27:52 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Kevin Hilman <khilman@...aro.org>
Cc:	Mats Liljegren <mats.liljegren@...a.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-dev@...ts.linaro.org
Subject: Re: [RFC/PATCH 1/5] context tracking: conditionalize guest support
 based on CONFIG_KVM

On Wed, Feb 20, 2013 at 11:41:38AM -0800, Kevin Hilman wrote:
> So that it can build on !KVM systems too.
> 
> Signed-off-by: Kevin Hilman <khilman@...aro.org>
> ---
>  kernel/context_tracking.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
> index 74f68f4..6fe96b1 100644
> --- a/kernel/context_tracking.c
> +++ b/kernel/context_tracking.c
> @@ -1,5 +1,7 @@
>  #include <linux/context_tracking.h>
> +#ifdef CONFIG_KVM
>  #include <linux/kvm_host.h>
> +#endif

The header should take care of the off-case, no need to ifdef its inclusion.

>  #include <linux/rcupdate.h>
>  #include <linux/sched.h>
>  #include <linux/hardirq.h>
> @@ -62,6 +64,7 @@ void user_exit(void)
>  	local_irq_restore(flags);
>  }
>  
> +#ifdef CONFIG_KVM
>  void guest_enter(void)
>  {
>  	if (vtime_accounting_enabled())
> @@ -79,6 +82,7 @@ void guest_exit(void)
>  		__guest_exit();
>  }
>  EXPORT_SYMBOL_GPL(guest_exit);
> +#endif

Kvm might be built as a module so we can't actually do this unfortunately.

Thanks.

>  
>  void context_tracking_task_switch(struct task_struct *prev,
>  			     struct task_struct *next)
> -- 
> 1.8.1.2
> 
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