linux-kernel - Re: [PATCH] xen/control: protect functions with CONFIG_HIBERNATE

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Message-ID: <20130715152714.GD5774@phenom.dumpdata.com>
Date:	Mon, 15 Jul 2013 11:27:14 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Julien Grall <julien.grall@...aro.org>
Cc:	stefano.stabellini@...citrix.com, ian.campbell@...rix.com,
	patches@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org
Subject: Re: [PATCH] xen/control: protect functions with
 CONFIG_HIBERNATE_CALLBACKS to avoid warning

On Mon, Jul 15, 2013 at 03:24:35PM +0100, Julien Grall wrote:
> If CONFIG_HIBERNATE_CALLBACKS is not set gcc will issue warnings:
> drivers/xen/manage.c:46:13: warning: 'xen_hvm_post_suspend' defined but not used [-Wunused-function]
> drivers/xen/manage.c:52:13: warning: 'xen_pre_suspend' defined but not used [-Wunused-function]
> drivers/xen/manage.c:59:13: warning: 'xen_post_suspend' defined but not used [-Wunused-function]

Have you checked the upstream kernel?
I see this:

commit 65e053a7038c608f89272d4fb1f899890c579f0a
Author: Stefano Stabellini <stefano.stabellini@...citrix.com>
Date:   Thu Jun 27 14:28:38 2013 +0100

    xen: ifdef CONFIG_HIBERNATE_CALLBACKS xen_*_suspend
    
    xen_hvm_post_suspend, xen_pre_suspend, xen_post_suspend are only used if
    CONFIG_HIBERNATE_CALLBACKS is defined, resulting in:
    
    drivers/xen/manage.c:46:13: warning: ‘xen_hvm_post_suspend’ defined but not used [-Wunused-function]
    drivers/xen/manage.c:52:13: warning: ‘xen_pre_suspend’ defined but not used [-Wunused-function]
    drivers/xen/manage.c:59:13: warning: ‘xen_post_suspend’ defined but not used [-Wunused-function]
    
    If the kernel config is missing CONFIG_HIBERNATE_CALLBACKS.
    
    Simply ifdef CONFIG_HIBERNATE_CALLBACKS the three functions.
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>


> 
> Signed-off-by: Julien Grall <julien.grall@...aro.org>
> ---
>  drivers/xen/manage.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
> index 412b96c..7680276 100644
> --- a/drivers/xen/manage.c
> +++ b/drivers/xen/manage.c
> @@ -36,6 +36,7 @@ enum shutdown_state {
>  /* Ignore multiple shutdown requests. */
>  static enum shutdown_state shutting_down = SHUTDOWN_INVALID;
>  
> +#ifdef CONFIG_HIBERNATE_CALLBACKS
>  struct suspend_info {
>  	int cancelled;
>  	unsigned long arg; /* extra hypercall argument */
> @@ -63,7 +64,6 @@ static void xen_post_suspend(int cancelled)
>  	xen_mm_unpin_all();
>  }
>  
> -#ifdef CONFIG_HIBERNATE_CALLBACKS
>  static int xen_suspend(void *data)
>  {
>  	struct suspend_info *si = data;
> -- 
> 1.7.10.4
> 
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