linux-kernel - Re: kernel.h: add ARRAY_AND_SIZE() macro to complement ARRAY

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Date:	Sat, 20 Sep 2008 21:12:16 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Christer Weinigel <christer@...nigel.se>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Russ Dill <russ.dill@...il.com>,
	Eric Miao <eric.y.miao@...il.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Ben Dooks <ben-linux@...ff.org>, linux-kernel@...r.kernel.org
Subject: Re: kernel.h: add ARRAY_AND_SIZE() macro to complement
	ARRAY_SIZE().

[Christer Weinigel - Sat, Sep 20, 2008 at 06:38:51PM +0200]
> Cyrill Gorcunov wrote:
>> [Christer Weinigel - Sat, Sep 20, 2008 at 04:28:19PM +0200]
>> ...
>>> In my opinion, making platform_add_devices into a magic macro is   
>>> actually worse, since the same construct (array, ARRAY_SIZE(array)) 
>>> is  used in many places, so one would have to do the same thing over 
>>> and  over again for every function.  In that case it's better to have 
>>> to  learn one macro once, and the ALL_CAPITALS should make it obvious 
>>> that  it is a macro.
>
>> Well, can't agree with you :) It's my _presonal_ opinion.
>> You could define it as
>>
>> static inline int platform_add_devices_array(struct platform_device **devs)
>> {
>> 	return platform_add_devices(devs, ARRAY_SIZE(devs));
>> }
>
> Won't work.  You would have to use a macro.  The above would turn into:
>
>      platform_add_devices(devs, 1);
>
> or would if the __must_be_array check didn't catch it.
>
>   /Christer
>

Ah...indeed, my bad :) gcc is not that smart (yet). So there only
the macro is possible (just forget that it will be different
namespace scope). Anyway even having it like a macro would be
better then hiding args.

		- Cyrill -
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