linux-kernel - Re: [PATCH v4 05/15] gpio: pxa: Use modern PM macros

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Message-ID: <aR5fwvGYqf1MAbq7@xhacker>
Date: Thu, 20 Nov 2025 08:24:34 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Doug Berger <opendmb@...il.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	bcm-kernel-feedback-list@...adcom.com,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Hoan Tran <hoan@...amperecomputing.com>,
	Andy Shevchenko <andy@...nel.org>, Daniel Palmer <daniel@...ngy.jp>,
	Romain Perier <romain.perier@...il.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Kevin Hilman <khilman@...nel.org>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Shubhrajyoti Datta <shubhrajyoti.datta@....com>,
	Srinivas Neeli <srinivas.neeli@....com>,
	Michal Simek <michal.simek@....com>, linux-gpio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v4 05/15] gpio: pxa: Use modern PM macros

On Wed, Nov 19, 2025 at 07:41:44PM +0200, Andy Shevchenko wrote:
> On Thu, Nov 20, 2025 at 12:33:17AM +0800, Jisheng Zhang wrote:
> > Use the modern PM macros for the suspend and resume functions to be
> > automatically dropped by the compiler when CONFIG_PM or
> > CONFIG_PM_SLEEP are disabled, without having to use #ifdef guards.
> > 
> > This has the advantage of always compiling these functions in,
> > independently of any Kconfig option. Thanks to that, bugs and other
> > regressions are subsequently easier to catch.
> 
> ...
> 
> >  static struct syscore_ops pxa_gpio_syscore_ops = {
> > -	.suspend	= pxa_gpio_suspend,
> > -	.resume		= pxa_gpio_resume,
> > +	.suspend	= pm_ptr(pxa_gpio_suspend),
> > +	.resume		= pm_ptr(pxa_gpio_resume),
> >  };
> 
> I believe this needs to be thoroughly checked and thought through as
> this is *not* a dev_pm_ops.

pm_ptr()/pm_sleep_ptr() is defined in pm.h, so I think we can make use
of it for syscore_ops as well.
E.g This patch makes use of pm_ptr() to optimize out .suspend/.resume when !PM
while get in them when PM. Thus the same result can be acchieved between
before and after this patch.

> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
>