linux-kernel - Re: [PATCH] pwm: fix Broadcom BCM7038 PWM driver

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Date:	Wed, 07 Oct 2015 15:31:07 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	linux-kernel@...r.kernel.org,
	bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
	linux-pwm@...r.kernel.org, ariel@...guardiasur.com.ar
Subject: Re: [PATCH] pwm: fix Broadcom BCM7038 PWM driver

On Tuesday 06 October 2015 17:51:30 Florian Fainelli wrote:
> On 06/10/15 12:59, Arnd Bergmann wrote:
> > The newly added pwm-brcmstb driver fails to build if CONFIG_PM_SLEEP
> > is enabled:
> > 
> > drivers/pwm/pwm-brcmstb.c: In function 'brcmstb_pwm_suspend':
> > drivers/pwm/pwm-brcmstb.c:309:42: error: 'dev' undeclared (first use in this function)
> >   struct brcmstb_pwm *p = dev_get_drvdata(dev);
> > 
> > This changes the name of the function argument to match its user.
> 
> Thanks, maybe, to avoid similar issues in the future, we should start
> removing the ifdef CONFIG_PM_SLEEP and instead annotate such functions
> with __maybe_unused. I wonder if we could magically make that happen
> with a coccinelle script that looks for SIMPLE_DEV_PM_OPS to know which
> functions to annotate... humm.

I think the best solution would be to replace SIMPLE_DEV_PM_OPS with
a macro that creates an unused reference to the functions. That
way, we could remove all the #ifdef CONFIG_PM_SLEEP from the kernel,
but we'd still have to use coccinelle to replace all the current
instances with the new macro.

	Arnd
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