linux-kernel - Re: [PATCH v3] ARM: smp: Only expose /sys/.../cpuX/online if hotpluggable

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Message-ID: <CAMuHMdWcuWacOxrTAYB3CBJHTN6SJfmVZTTT4oxHJwj+qTLGOw@mail.gmail.com>
Date:	Mon, 16 Feb 2015 10:03:54 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <mark.rutland@....com>,
	Nicolas Pitre <nico@...aro.org>,
	Dave Martin <Dave.Martin@....com>,
	Simon Horman <horms@...ge.net.au>,
	Magnus Damm <magnus.damm@...il.com>,
	Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH v3] ARM: smp: Only expose /sys/.../cpuX/online if hotpluggable

On Sat, Feb 14, 2015 at 1:42 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> --- a/arch/arm/include/asm/smp.h
> +++ b/arch/arm/include/asm/smp.h
> @@ -104,6 +104,7 @@ struct smp_operations {
>  #ifdef CONFIG_HOTPLUG_CPU
>         int  (*cpu_kill)(unsigned int cpu);
>         void (*cpu_die)(unsigned int cpu);
> +       int  (*cpu_can_disable)(unsigned int cpu);

Perhaps this should be changed to return bool while you're adding the function?
That saves us from an atomic update later when someone does janitorial work.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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