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.

[Borislav Petkov <bp@alien8.de>]

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

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

> Signed-off-by: Fenghua Yu <fenghua.yu@intel.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.