Re: [PATCH 1/4] gpio: mvebu: Add limited PWM support

On Mon, Mar 20, 2017 at 2:51 PM, Thierry Reding
[off-list ref] wrote:

On Fri, Mar 17, 2017 at 10:17:47AM +0100, Ralph Sennhauser wrote:

quoted

On Thu, 16 Mar 2017 17:03:05 +0100
Linus Walleij [off-list ref] wrote:

[...]

quoted

quoted

quoted

+static void mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip)
+static void mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip)

I think both of these need to be tagged __maybe_unused to not give
noise in randconfig builds.

I haven't seen any warnings with CONFIG_PWM disabled. Which
configuration you expect to trigger a warning? mvebu_pwm_probe should
be the same, right?

It's got nothing to do with CONFIG_PWM and as far as I can tell your
usage of IS_ENABLED() is fine here. However, if you try building the
driver with a !PM configuration, both *_suspend() and *_resume() end
up being unused and giving you a warning.

Yes I was referring to the !PM case.

Those are not found by zeroday builds.

But they are found a couple of days later by Arnd Bergmann running
randconfig builds.

Yours,
Linus Walleij