linux-kernel - Re: [PATCH 1/3] gpio: pseudo: common helper functions for pseudo gpio devices

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Message-ID: <osk442flgow3px5jilhrn57xm2ha5wyrsnjae2mz4ht2dvgg2t@e7bzgjqawgik>
Date: Tue, 18 Feb 2025 23:44:52 +0900
From: Koichiro Den <koichiro.den@...onical.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: linux-gpio@...r.kernel.org, brgl@...ev.pl, linus.walleij@...aro.org, 
	maciej.borzecki@...onical.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] gpio: pseudo: common helper functions for pseudo
 gpio devices

On Tue, Feb 18, 2025 at 02:24:32PM GMT, Geert Uytterhoeven wrote:
> Hi Den-san,
> 
> On Mon, 17 Feb 2025 at 15:28, Koichiro Den <koichiro.den@...onical.com> wrote:
> > Both gpio-sim and gpio-virtuser share a mechanism to instantiate a
> > platform device and wait synchronously for probe completion.
> > With gpio-aggregator adopting the same approach in a later commit for
> > its configfs interface, it's time to factor out the common code.
> >
> > Add gpio-pseudo.[ch] to house helper functions used by all the pseudo
> > GPIO device implementations.
> >
> > No functional change.
> >
> > Signed-off-by: Koichiro Den <koichiro.den@...onical.com>
> 
> Thanks for your patch!
> 
> > --- /dev/null
> > +++ b/drivers/gpio/gpio-pseudo.c
> 
> > +int pseudo_gpio_register(struct pseudo_gpio_common *common,
> > +                        struct platform_device_info *pdevinfo)
> > +{
> > +       struct platform_device *pdev;
> > +       char *name;
> > +
> > +       name = kasprintf(GFP_KERNEL, "%s.%u", pdevinfo->name, pdevinfo->id);
> > +       if (!name)
> > +               return -ENOMEM;
> > +
> > +       common->driver_bound = false;
> > +       common->name = name;
> > +       reinit_completion(&common->probe_completion);
> > +       bus_register_notifier(&platform_bus_type, &common->bus_notifier);
> > +
> > +       pdev = platform_device_register_full(pdevinfo);
> > +       if (IS_ERR(pdev)) {
> > +               bus_unregister_notifier(&platform_bus_type, &common->bus_notifier);
> > +               kfree(common->name);
> 
> On arm32:
> error: implicit declaration of function ‘kfree’
> 
> Adding #include <linux/slab.h> fixes that.
> Probably you want to include a few more, to avoid relying on
> implicit includes.

Thank you for pointing that out!

Koichiro

> 
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds