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<PN3PR01MB959786A68923B2D471C129E6B8D02@PN3PR01MB9597.INDPRD01.PROD.OUTLOOK.COM>
Date: Wed, 12 Mar 2025 19:35:54 +0000
From: Aditya Garg <gargaditya08@...e.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC: Sven Peter <sven@...npeter.dev>, Thomas Zimmermann <tzimmermann@...e.de>,
Aun-Ali Zaidi <admin@...eit.net>, Maxime Ripard <mripard@...nel.org>,
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<linux-doc@...r.kernel.org>, Hector Martin <marcan@...can.st>,
"asahi@...ts.linux.dev" <asahi@...ts.linux.dev>
Subject: Re: [PATCH 1/2] lib/vsprintf: Add support for generic FourCCs by
extending %p4cc
> On 13 Mar 2025, at 12:58 AM, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
>
> On Wed, Mar 12, 2025 at 07:14:36PM +0000, Aditya Garg wrote:
>>>> On 12 Mar 2025, at 9:05 PM, Sven Peter <sven@...npeter.dev> wrote:
>>> On Wed, Mar 12, 2025, at 13:03, Aditya Garg wrote:
>
> ...
>
>>> I don't have a strong opinion either way: for SMC I just need to print
>>> FourCC keys for debugging / information in a few places.
>>>
>>> I'm preparing the SMC driver for upstreaming again (after a two year delay :-()
>>> and was just going to use macros to print the SMC FourCC keys similar to
>>> DRM_MODE_FMT/DRM_MODE_ARG for now to keep the series smaller and revisit
>>> the topic later.
>>>
>>> Right now I have these in my local tree (only compile tested so far):
>>>
>>> #define SMC_KEY_FMT "%c%c%c%c (0x%08x)"
>>> #define SMC_KEY_ARG(k) (k)>>24, (k)>>16, (k)>>8, (k), (k)
>>
>> That seems to be a nice alternative, which I guess Thomas was also suggesting.
>
> I don't think it's "nice". Each of the approaches has pros and cons.
I would prefer vsprintf, but if it's not there, that remains as nice right?
> You can start from bloat-o-meter here and compare it with your %p extension.
>
> Also, can you show the bloat-o-meter output for the vsprintf.c?
vsprintf isn't a kernel module, is it? I'll have to compile a new kernel I guess.
>
>>> which are then used like this:
>>>
>>> dev_info(dev,
>>> "Initialized (%d keys " SMC_KEY_FMT " .. " SMC_KEY_FMT ")\n",
>>> smc->key_count, SMC_KEY_ARG(smc->first_key),
>>> SMC_KEY_ARG(smc->last_key));
>
> --
> With Best Regards,
> Andy Shevchenko
>
>
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