linux-kernel - Re: [PATCH] arm64: arch_timer: mark errata handlers as __maybe

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Date:   Wed, 19 Apr 2017 20:12:43 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: arch_timer: mark errata handlers as __maybe_unused

On Wed, Apr 19, 2017 at 07:37:09PM +0200, Arnd Bergmann wrote:
> In some rare randconfig builds, we end up with two functions being entirely
> unused:
> 
> drivers/clocksource/arm_arch_timer.c:342:12: error: 'erratum_set_next_event_tval_phys' defined but not used [-Werror=unused-function]
>  static int erratum_set_next_event_tval_phys(unsigned long evt,
> drivers/clocksource/arm_arch_timer.c:335:12: error: 'erratum_set_next_event_tval_virt' defined but not used [-Werror=unused-function]
>  static int erratum_set_next_event_tval_virt(unsigned long evt,
> 
> We could add an #ifdef around them, but we would already have to check for
> several symbols there and there is a chance this would get more complicated
> over time, so marking them as __maybe_unused is the simplest way to avoid the
> harmless warnings.
> 
> Fixes: 01d3e3ff2608 ("arm64: arch_timer: Rework the set_next_event workarounds")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>