Re: [PATCH 1/2] regulator: core: Use a bitfield for continuous_voltage_range

From: Joe Perches
Date: Fri Jan 22 2016 - 16:42:43 EST


On Fri, 2016-01-22 at 21:31 +0000, Mark Brown wrote:
> 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.

Sure, but intelligibility is useful too.
Do you expect to have more than 4 of these flags?