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

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Message-id: <20160218014610.GJ10719@samsunx.samsung>
Date:	Thu, 18 Feb 2016 10:46:10 +0900
From:	Andi Shyti <andi.shyti@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...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

> >> 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.

no, I mean remove it from s2mps11_info. Other than in the probe
this value is used only once in s2mps11_pmic_dt_parse() (which is
called by probe()).

Andi