linux-kernel - Re: [SMP BUG?] the return value of is

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Date:	Mon, 01 Sep 2014 10:49:09 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Wang Long <long.wanglong@...wei.com>, linux@....linux.org.uk,
	santosh.shilimkar@...com, victor.kamensky@...aro.org,
	nico@...aro.org, ben.dooks@...ethink.co.uk, cov@...eaurora.org,
	linux-kernel@...r.kernel.org
Subject: Re: [SMP BUG?] the return value of is_smp() is bug?

On Monday 01 September 2014 19:35:34 Wang Long wrote:
> In kernel 3.17-rc2, when i set CONFIG_HAVE_SMP = y and CONFIG_SMP_ON_UP = y 
> in .config file. the secondary core can not boot.
> 
> when i set CONFIG_HAVE_SMP = y and CONFIG_SMP_ON_UP = n in .config file,
> the secondary core can boot.
> 
> But this does not happen in kernel 3.10 lts kernel, Whether the 
> CONFIG_SMP_ON_UP is set yes or no ,the secondary core can boot.
> 
> Does the meaning of CONFIG_SMP_ON_UP changed or this is a bug in kernel 3.17-rc2 ? 
> 
> 
> I write the following patch to test the return value of is_smp().
> 

Can you check the value of CONFIG_SMP?

CONFIG_HAVE_SMP is set by platforms that allow enabling SMP, but you
still have the choice to set CONFIG_SMP on or off.

	Arnd
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