linux-kernel - Re: [PATCH v2] regulator: s2mps11: Simplify expression used in BUILD_BUG

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Message-id: <56C520A7.40201@samsung.com>
Date:	Thu, 18 Feb 2016 10:38:47 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Andi Shyti <andi.shyti@...sung.com>
Cc:	Sangbeom Kim <sbkim73@...sung.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, jacob.e.keller@...el.com,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v2] regulator: s2mps11: Simplify expression used in
 BUILD_BUG_ON

On 18.02.2016 10:37, Andi Shyti wrote:
> Hi Krzysztof,
> 
>> Following BUILD_BUG_ON using a variable fails for some of the compilers
>> and optimization levels (reported for gcc 4.9):
>> 	var = ARRAY_SIZE(s2mps15_regulators);
>> 	BUILD_BUG_ON(S2MPS_REGULATOR_MAX < var);
>> Fix this by using ARRAY_SIZE directly.
>>
>> Additionally add missing BUILD_BUG_ON check for S2MPS15 device (the
>> check ensures that internal arrays are big enough to hold data for all
>> of regulators on all devices).
>>
>> Reported-by: Arnd Bergmann <arnd@...db.de>
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
>>
> 
> [...]
> 
>>  	case S2MPS11X:
>>  		s2mps11->rdev_num = ARRAY_SIZE(s2mps11_regulators);
> 
> Why don't we remove rdev_num at all? It's not used that much
> other than in the probe function.

Remove from probe? It is used in probe and removal would make the code
more complicated than it should be.

Best regards,
Krzysztof