linux-kernel - Re: [PATCH 4/6] kexec: A new system call, kexec_file

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Date:	Fri, 29 Nov 2013 11:10:48 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	mjg59@...f.ucam.org, greg@...ah.com, ebiederm@...ssion.com,
	hpa@...or.com
Subject: Re: [PATCH 4/6] kexec: A new system call, kexec_file_load, for in
 kernel kexec

On 11/20/13 at 12:50pm, Vivek Goyal wrote:
> diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
> index 4eabc16..fb41b73 100644
> --- a/arch/x86/kernel/machine_kexec_64.c
> +++ b/arch/x86/kernel/machine_kexec_64.c
> @@ -22,6 +22,13 @@
>  #include <asm/mmu_context.h>
>  #include <asm/debugreg.h>
>  
> +/* arch dependent functionality related to kexec file based syscall */
> +static struct kexec_file_type kexec_file_type[]={
> +	{"", NULL, NULL, NULL, NULL},
> +};
> +
> +
> +void *arch_kexec_kernel_image_load(struct kimage *image, char *kernel,
> +			unsigned long kernel_len, char *initrd,
> +			unsigned long initrd_len, char *cmdline,
> +			unsigned long cmdline_len)
> +{
> +	int idx = image->file_handler_idx;
> +
> +	if (idx < 0)
> +		return ERR_PTR(-ENOEXEC);
> +
> +	return kexec_file_type[idx].load(image, kernel, kernel_len, initrd,
> +					initrd_len, cmdline, cmdline_len);
> +}
> +
> +int arch_image_file_post_load_cleanup(struct kimage *image)
> +{

Hi Vivek,

This function is defined as one of arch specific fucntion set, why don't
we name it in a unified prefix as others.

And name of the default dummy function in kernel/kexec.c is not consistent
with the arch specific one, so currently
arch_image_file_post_load_cleanup of x86 arch is not called. Please
consider wihch one need be changed.

> +
> +void __attribute__ ((weak))
> +arch_kimage_file_post_load_cleanup(struct kimage *image)
> +{
> +	return;
> +}
> +


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