linux-kernel - Re: [PATCH 1/2] regulator: core: Use a bitfield for continuous_voltage

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Date:	Fri, 22 Jan 2016 21:31:15 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Paul Kocialkowski <contact@...lk.fr>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] regulator: core: Use a bitfield for
 continuous_voltage_range

On Fri, Jan 22, 2016 at 11:15:28AM -0800, Joe Perches wrote:
> On Thu, 2016-01-21 at 20:24 +0000, Mark Brown wrote:

> > -	bool continuous_voltage_range;
> > +	unsigned int continuous_voltage_range:1;

> Is this really valuable?

> There are already padding bytes that are unused
> and adding a couple more bools would be space
> cost-free and more readable.

> I believe that read/write of bytes is also more
> efficient on some architectures than bit field
> read/modify/write uses.

It adds up when you get more flags and these are not in the least bit
performance sensitive.

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