linux-kernel - Re: [PATCH]ipmi:ipmi_si_intf.c Fix warning: variable 'addr

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Date:	Tue, 06 Jul 2010 08:57:10 -0500
From:	Corey Minyard <minyard@....org>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	akpm@...ux-foundation.org,
	openipmi-developer@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH]ipmi:ipmi_si_intf.c Fix warning: variable 'addr_space' set
 but not used

Well, this patch is incorrect because IPMI_IO_ADDR_SPACE is zero.  I'm 
not sure what your change is trying to accomplish, anyway.  This is 
actually dead code from a previous change, I believe, and just needs to 
be removed.  I did find that document at 
http://h21007.www2.hp.com/portal/download/files/unprot/hpspmi.pdf, not 
sure if there's a more reliable place to find it.

-corey

On 07/05/2010 11:31 PM, Justin P. Mattock wrote:
> Remove addr_space in exchange for two symbols that represent
> mm = IPMI_MEM_ADDR_SPACE;
> io = IPMI_IO_ADDR_SPACE;
> then add a dev_warn printing information so that GCC doesn't give a
> warning when building the kernel.
> the original warning from GCC is this:
>
>    CC [M]  drivers/char/ipmi/ipmi_si_intf.o
> drivers/char/ipmi/ipmi_si_intf.c: In function 'try_init_spmi':
> drivers/char/ipmi/ipmi_si_intf.c:2016:8: warning: variable 'addr_space' set but not used
>
> And also the web address pointing to a *.pdf is no where to be found(or atleast I couldn't
> find it), so just use the web site itself(if somebody has the *.pdf
> let me know I can change this).
>
> Signed-off-by: Justin P. Mattock<justinmattock@...il.com>
>
> ---
>   drivers/char/ipmi/ipmi_si_intf.c |   14 +++++++++-----
>   1 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 094bdc3..969e69a 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -1965,8 +1965,7 @@ static int acpi_gpe_irq_setup(struct smi_info *info)
>
>   /*
>    * Defined at
> - * http://h21007.www2.hp.com/dspp/files/unprotected/devresource/
> - * Docs/TechPapers/IA64/hpspmi.pdf
> + * http://h21007.www2.hp.com/portal/site/dspp
>    */
>   struct SPMITable {
>   	s8	Signature[4];
> @@ -2013,7 +2012,7 @@ struct SPMITable {
>   static __devinit int try_init_spmi(struct SPMITable *spmi)
>   {
>   	struct smi_info  *info;
> -	u8 		 addr_space;
> +	u8		mem, io;
>
>   	if (spmi->IPMIlegacy != 1) {
>   		printk(KERN_INFO PFX "Bad SPMI legacy %d\n", spmi->IPMIlegacy);
> @@ -2021,9 +2020,14 @@ static __devinit int try_init_spmi(struct SPMITable *spmi)
>   	}
>
>   	if (spmi->addr.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
> -		addr_space = IPMI_MEM_ADDR_SPACE;
> +		mem = IPMI_MEM_ADDR_SPACE;
>   	else
> -		addr_space = IPMI_IO_ADDR_SPACE;
> +		io  = IPMI_IO_ADDR_SPACE;
> +
> +	if (mem || io) {
> +		dev_warn(info->dev, "spmi address space %d\n", mem ?: io);
> +		return 0;
> +	}
>
>   	info = kzalloc(sizeof(*info), GFP_KERNEL);
>   	if (!info) {
>    

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