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

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Message-ID: <lu3hoc$lrl$1@ger.gmane.org>
Date:	Tue, 2 Sep 2014 04:40:44 +0000 (UTC)
From:	Leon Yu <"Leon Yu"@ccca.nctu.edu.tw>
To:	linux-kernel@...r.kernel.org
Subject: Re: [SMP BUG?] the return value of is_smp() is bug?

On 2014-09-01, Wang Long <long.wanglong@...wei.com> wrote:
>
> Hi,all
>
> 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 kernel3.17-rc2 ? 

Update qemu to at least 2.0.

qemu of older version fails to smp-boot Linux 3.12+ with CONFIG_SMP_ON_UP
enabled.

-Leon

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