[PATCH] sched/rt: hide push_irq_work_func declaration
Steven Rostedt
rostedt at goodmis.org
Thu Nov 12 06:47:39 PST 2015
On Thu, 12 Nov 2015 15:22:22 +0100
Arnd Bergmann <arnd at arndb.de> wrote:
> The push_irq_work_func() function is conditionally defined only
> when both CONFIG_SMP and HAVE_RT_PUSH_IPI are defined, but the
> forward declaration remains visibile without HAVE_RT_PUSH_IPI,
> causing a gcc warning in ARM64 allnoconfig:
>
> kernel/sched/rt.c:68:13: warning: 'push_irq_work_func' declared 'static' but never defined [-Wunused-function]
>
> This changes the code to use the same condition for both the
> declaration and the function definition, which gets rid of the
> warning.
>
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
> Fixes: b6366f048e0c ("sched/rt: Use IPI to trigger RT task push migration instead of pulling")
> ---
> Found on arm64 allnoconfig
>
> diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
> index e3cc16312046..ce7b36d6f477 100644
> --- a/kernel/sched/rt.c
> +++ b/kernel/sched/rt.c
> @@ -64,7 +64,7 @@ static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
> raw_spin_unlock(&rt_b->rt_runtime_lock);
> }
>
> -#ifdef CONFIG_SMP
> +#if IS_ENABLED(CONFIG_SMP) && defined(HAVE_RT_PUSH_IPI)
Why IS_ENABLED() and not defined()?
#if defined(CONFIG_SMP) && defined(HAVE_RT_PUSH_IPI)
I thought IS_ENABLED() is used for C code, like:
if (IS_ENABLED(CONFIG_SMP)) {
[...]
}
-- Steve
> static void push_irq_work_func(struct irq_work *work);
> #endif
>
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