Re: [PATCH] ARM: CCI : Fix implicit declaration of function error

[Dave Martin <Dave.Martin@arm.com>]

On Mon, Oct 14, 2013 at 03:52:27PM +0530, Majunath Goudar wrote:
> This patch adds a inline dummy implementations of_find_matching_node()
> in "#ifdef CONFIG_OF" else part. Without this patch,build system can
> lead to issues. This was discovered during randconfig testing,in which
> ARM_CCI was enabled w/o CONFIG_OF being enabled,leading to the following error:

Without fetching config info from the DT, the CCI driver is not usable,
so it makes no sense to build this driver without CONFIG_OF.

Your previous patch [1] looked sensible, but I don't see any responses
on lakml.  Are you still pursuing that patch, or is this patch intended
as a replacement?


Dummy functions for things like of_find_matching_node() might be useful
for drivers that can fall back to other config mechanisms if OF is
unavailable, but that is a separate discussion.

arm-cci is not such a driver, and any such drivers that exist toady
must be coping without the dummy OF functions.

Cheers
---Dave

[1]  http://lists.infradead.org/pipermail/linux-arm-kernel/2013-October/202996.html
([PATCH] BUS: CCI : Fix arm-cci implicit declarations dependence errors.)

> 
> CC      drivers/bus/arm-cci.o
> drivers/bus/arm-cci.c: In function ‘cci_probe’:
> drivers/bus/arm-cci.c:971:2: error: implicit declaration of function
> ‘of_find_matching_node’ [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors
> make[2]: *** [drivers/bus/arm-cci.o] Error 1
> make[1]: *** [drivers/bus] Error 2
> make: *** [drivers] Error 2
> 
> Signed-off-by: Manjunath Goudar <manju.goudar@lge.com>
> Cc: Grant Likely <grant.likely@linaro.org>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: devicetree@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
>  include/linux/of.h |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/include/linux/of.h b/include/linux/of.h
> index f95aee3..2c57aa2 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -340,6 +340,13 @@ int of_device_is_stdout_path(struct device_node *dn);
>  
>  #else /* CONFIG_OF */
>  
> +static inline struct device_node *of_find_matching_node(
> +	struct device_node *from,
> +	const struct of_device_id *matches)
> +{
> +	return NULL;
> +}
> +
>  static inline const char* of_node_full_name(struct device_node *np)
>  {
>  	return "<no-node>";
> -- 
> 1.7.9.5
> 
> 
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