linux-kernel - Re: [PATCH] of/address: sparc: Declare of_address_to_resource() as an extern function for sparc again

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Date:	Mon, 05 Nov 2012 11:21:04 +0100
From:	Andreas Larsson <andreas@...sler.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Grant Likely <grant.likely@...retlab.ca>, davem@...emloft.net,
	Rob Herring <rob.herring@...xeda.com>,
	sparclinux@...r.kernel.org, software@...sler.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of/address: sparc: Declare of_address_to_resource() as
 an extern function for sparc again

On 2012-11-02 18:53, Sam Ravnborg wrote:
> Hi Andreas.
> On Fri, Nov 02, 2012 at 12:03:56PM +0100, Andreas Larsson wrote:
>> This bug-fix makes sure that of_address_to_resource is defined extern for sparc
>> so that the sparc-specific implementation of of_address_to_resource() is once
>> again used when including include/linux/of_address.h in a sparc context. A
>> number of drivers in mainline relies on this function working for sparc.
>
> How about following (untested) approach.
> diff --git a/arch/sparc/include/asm/prom.h b/arch/sparc/include/asm/prom.h
> index c287651..8194801 100644
> --- a/arch/sparc/include/asm/prom.h
> +++ b/arch/sparc/include/asm/prom.h
> @@ -63,5 +63,8 @@ extern char *of_console_options;
>   extern void irq_trans_init(struct device_node *dp);
>   extern char *build_path_component(struct device_node *dp);
>
> +/* SPARC has a local implementation */
> +#define of_address_to_resource of_address_to_resource
> +
>   #endif /* __KERNEL__ */
>   #endif /* _SPARC_PROM_H */
> diff --git a/include/linux/of_address.h b/include/linux/of_address.h
> index a1984dd..e20e3af 100644
> --- a/include/linux/of_address.h
> +++ b/include/linux/of_address.h
> @@ -28,11 +28,13 @@ static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }
>   #endif
>
>   #else /* CONFIG_OF_ADDRESS */
> +#ifndef of_address_to_resource
>   static inline int of_address_to_resource(struct device_node *dev, int index,
>   					 struct resource *r)
>   {
>   	return -EINVAL;
>   }
> +#endif
>   static inline struct device_node *of_find_matching_node_by_address(
>   					struct device_node *from,
>   					const struct of_device_id *matches,
>
> We use prom.h to teach the general of layer what SPARC provides.
> In prom.h we define the symbol of_address_to_resource which tell
> of_address.h that we have a local definition of this function, and
> the static version is skipped.
>
> This looks more elegant as we do not have to hardcode SPARC in of_address.h
> and this is easy to re-use the sme pattern in other places.

I agree that this is a much nicer approach! I'll send a v2 based on this.

Thanks for the feedback!

Cheers,
Andreas

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