linux-kernel - Re: [PATCH v2] ARM: smp: Only expose /sys/.../cpuX/online if hotpluggable

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Date:	Fri, 13 Feb 2015 22:57:04 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Stephen Boyd <sboyd@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Mark Rutland <mark.rutland@....com>,
	Nicolas Pitre <nico@...aro.org>,
	Dave Martin <Dave.Martin@....com>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org
Subject: Re: [PATCH v2] ARM: smp: Only expose /sys/.../cpuX/online if
 hotpluggable

On Fri, Feb 13, 2015 at 03:20:04PM -0500, Simon Horman wrote:
> > -static int r8a7779_cpu_disable(unsigned int cpu)
> > -{
> > -	/* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
> > -	return cpu == 0 ? -EPERM : 0;
> > -}
...
> Its not clear to me why r8a7779_cpu_disable() has been
> removed rather than replaced by r8a7779_cpu_can_disable()

This is the default if you don't provide a cpu_disable function, so it
should be removed irrespective of this patch.

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