linux-kernel - Re: [PATCH v2 04/11] iio: adc: ad_sigma_delta: use BITS_TO

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Message-ID: <aGPm1td5sEqp5R9H@smile.fi.intel.com>
Date: Tue, 1 Jul 2025 16:47:02 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: David Lechner <dlechner@...libre.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Mark Brown <broonie@...nel.org>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH v2 04/11] iio: adc: ad_sigma_delta: use BITS_TO_BYTES()
 macro

On Mon, Jun 30, 2025 at 08:33:59AM -0500, David Lechner wrote:
> On 6/30/25 3:59 AM, Andy Shevchenko wrote:
> > On Sat, Jun 28, 2025 at 03:56:43PM +0100, Jonathan Cameron wrote:
> >> On Fri, 27 Jun 2025 18:40:00 -0500
> >> David Lechner <dlechner@...libre.com> wrote:

...

> >>> -	samples_buf_size = ALIGN(slot * indio_dev->channels[0].scan_type.storagebits / 8, 8);
> >>> +	samples_buf_size = ALIGN(slot * BITS_TO_BYTES(scan_type->storagebits), 8);
> >>
> >> Ah. You do it here. Fair enough and no problem wrt to patch 1 then.
> > 
> > Hmm... Should the second 8 be something like sizeof(unsigned long lone) for
> > semantic distinguishing with 8-bit bytes?
> 
> Yeah, I considered to use sizeof(s64) to match the next line, but it
> it seems like a separate change, so in the end I decided against doing
> it in this patch and it seems too small of a thing for a separate patch.

The problem in not the size of the change, the problem is that semantically
those 8:s are _different_ and code readability will be much better if we make
them so explicitly.

-- 
With Best Regards,
Andy Shevchenko