[PATCH 1/2] lib/vsprintf: Add support for generic FourCCs by extending %p4cc

[Andy Shevchenko]

On Wed, Mar 12, 2025 at 07:14:36PM +0000, Aditya Garg wrote:
> > On 12 Mar 2025, at 9:05 PM, Sven Peter <sven at svenpeter.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.
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?

> > 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