linux-kernel - Re: [PATCH] sched/rt: hide push_irq_work

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Date:	Thu, 12 Nov 2015 16:14:06 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/rt: hide push_irq_work_func declaration

On Thursday 12 November 2015 09:47:39 Steven Rostedt wrote:
> > -#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)) {
>                 [...]
>         }

"#if IS_ENABLED(CONFIG_foo)" has another property, which is
to evaluate to true when Kconfig has set the symbol to "=m".
Obviously that cannot happen for CONFIG_SMP, but some
maintainers prefer using IS_ENABLED() consistently for all
config symbols.

I don't care much either way, and it's easily changed if
we still want the patch and you prefer a plain #if defined().

	Arnd
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