linux-kernel - Re: [PATCH 08/10] Introduce functions to restart a process

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Date:	Mon, 20 Oct 2008 11:23:24 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	Andrey Mirkin <major@...nvz.org>
CC:	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [PATCH 08/10] Introduce functions to restart a process

Hello Andrey !


> diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
> index 109792b..a4848a3 100644
> --- a/arch/x86/kernel/entry_32.S
> +++ b/arch/x86/kernel/entry_32.S
> @@ -225,6 +225,7 @@ ENTRY(ret_from_fork)
>  	GET_THREAD_INFO(%ebp)
>  	popl %eax
>  	CFI_ADJUST_CFA_OFFSET -4
> +ret_from_fork_tail:
>  	pushl $0x0202			# Reset kernel eflags
>  	CFI_ADJUST_CFA_OFFSET 4
>  	popfl
> @@ -233,6 +234,26 @@ ENTRY(ret_from_fork)
>  	CFI_ENDPROC
>  END(ret_from_fork)
>  
> +ENTRY(i386_ret_from_resume)
> +	CFI_STARTPROC
> +	pushl %eax
> +	CFI_ADJUST_CFA_OFFSET 4
> +	call schedule_tail
> +	GET_THREAD_INFO(%ebp)
> +	popl %eax
> +	CFI_ADJUST_CFA_OFFSET -4
> +	movl (%esp), %eax
> +	testl %eax, %eax
> +	jz    1f
> +	pushl %esp
> +	call  *%eax
> +	addl  $4, %esp
> +1:
> +	addl  $256, %esp
> +	jmp   ret_from_fork_tail
> +	CFI_ENDPROC
> +END(i386_ret_from_resume)

Could you explain why you need to do this  

	call  *%eax

is it related to the freezer code ? 

C.
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