linux-kernel - Re: [PATCH v7 07/12] start_cpu0() is defined in head_32.S for 32-bit. The function sets up stack and jumps to start

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Date:	Fri, 24 Aug 2012 11:35:57 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Asit K Mallick <asit.k.mallick@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Arjan Dan De Ven <arjan@...ux.intel.com>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Len Brown <len.brown@...el.com>,
	"Srivatssa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Chen Gong <gong.chen@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v7 07/12] start_cpu0() is defined in head_32.S for
 32-bit. The function sets up stack and jumps to start_secondary() for CPU0
 wake up.

On Thu, Aug 23, 2012 at 05:56:06PM -0700, Fenghua Yu wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 

Looks like the extra-long Subject line belongs in here where the commit
message should be.

> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
>  arch/x86/kernel/head_32.S |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
> index d42ab17..964f87a 100644
> --- a/arch/x86/kernel/head_32.S
> +++ b/arch/x86/kernel/head_32.S
> @@ -266,6 +266,18 @@ num_subarch_entries = (. - subarch_entries) / 4
>  	jmp default_entry
>  #endif /* CONFIG_PARAVIRT */
>  
> +#ifdef CONFIG_HOTPLUG_CPU
> +/*
> + * Boot CPU0 entry point. It's called from play_dead(). Everything has been set
> + * up already except stack. We just set up stack here. Then call
> + * start_secondary().
> + */
> +ENTRY(start_cpu0)
> +	movl stack_start, %ecx
> +	movl %ecx, %esp
> +	jmp  *(initial_code)
> +#endif
> +
>  /*
>   * Non-boot CPU entry point; entered from trampoline.S
>   * We can't lgdt here, because lgdt itself uses a data segment, but
> -- 
> 1.7.2
> 
> --
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-- 
Regards/Gruss,
    Boris.
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