linux-kernel - Re: [PATCH] of: Turn of_match_node into a static inline when CONFIG

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Date:	Mon, 17 Feb 2014 18:18:29 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-kernel@...r.kernel.org
Cc:	devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] of: Turn of_match_node into a static inline when CONFIG_OF isn't set

On Tue, 11 Feb 2014 13:36:51 +0100, Laurent Pinchart <laurent.pinchart@...asonboard.com> wrote:
> when CONFIG_OF is disabled of_match_node is defined as a macro that
> evaluates to NULL. This breaks compilation of drivers that dereference
> the function's return value directly. Fix it by turning the macro into a
> static inline function that returns NULL.

Is it not more problematic that code is dereferencing the return value
directly *without* checking to see if it is NULL first? I suppose it
will cause a runtime oops on all platforms except no-mmu, but still.
Compile time catches are better.

g.

> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
>  include/linux/of.h | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/of.h b/include/linux/of.h
> index 70c64ba..719e69f 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -560,7 +560,13 @@ static inline const char *of_prop_next_string(struct property *prop,
>  }
>  
>  #define of_match_ptr(_ptr)	NULL
> -#define of_match_node(_matches, _node)	NULL
> +
> +static inline const struct of_device_id *of_match_node(
> +	const struct of_device_id *matches, const struct device_node *node)
> +{
> +	return NULL;
> +}
> +
>  #endif /* CONFIG_OF */
>  
>  #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
> -- 
> Regards,
> 
> Laurent Pinchart
> 

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