linux-kernel - Re: [PATCH v1 02/14] serial: core: Add UPIO

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Message-ID: <ZdiyzKMZPlkN462G@smile.fi.intel.com>
Date: Fri, 23 Feb 2024 16:59:24 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Jiri Slaby <jirislaby@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org, linux-rpi-kernel@...ts.infradead.org,
	linux-mips@...r.kernel.org, linux-tegra@...r.kernel.org,
	Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Al Cooper <alcooperx@...il.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Paul Cercueil <paul@...pouillou.net>,
	Vladimir Zapolskiy <vz@...ia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v1 02/14] serial: core: Add UPIO_UNSET constant for unset
 port type

On Fri, Feb 23, 2024 at 06:42:15AM +0100, Jiri Slaby wrote:
> On 22. 02. 24, 14:21, Andy Shevchenko wrote:
> > On Thu, Feb 22, 2024 at 07:58:32AM +0100, Jiri Slaby wrote:
> > > On 21. 02. 24, 19:31, Andy Shevchenko wrote:

..

> > > >    	unsigned char		iotype;			/* io access style */
> > > > +#define UPIO_UNSET		((unsigned char)~0U)	/* UCHAR_MAX */
> > > 
> > > Perhaps making the var u8 and this U8_MAX then? It would make more sense to
> > > me.
> > 
> > WFM, should it be a separate change?
> 
> Likely.

Then I need a commit message, because I'm unable to justify this change myself.

> > Btw, how can I justify it?
> 
> Hmm, thinking about it, why is it not an enum?

Maybe, but it is a replica of UAPI definitions, do we want to see it as a enum?
To me it will be a bit ugly looking.

> But it could be also an u8 because you want it be exactly 8 bits as you want
> to be sure values up to 255 fit.

Depends on what we assume UAPI does with those flags. It maybe even less than
8 bits, or great than, currently 8 bits is enough...

TL;DR: I would rather take a patch from you and incorporate into the series
than trying hard to invent a justification and proper type.

-- 
With Best Regards,
Andy Shevchenko