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

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Message-ID: <20131202152717.GC8340@dhcp12-158.nay.redhat.com>
Date:	Mon, 2 Dec 2013 23:27:17 +0800
From:	WANG Chao <chaowang@...hat.com>
To:	Baoquan He <bhe@...hat.com>
Cc:	Vivek Goyal <vgoyal@...hat.com>, mjg59@...f.ucam.org,
	greg@...ah.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, ebiederm@...ssion.com, hpa@...or.com
Subject: Re: [PATCH 4/6] kexec: A new system call, kexec_file_load, for in
 kernel kexec

On 11/29/13 at 11:10am, Baoquan He wrote:
> 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.

I think arch_kimage_file_post_load_cleanup should be used here.

And Good catch!

Thanks
WANG Chao

> 
> > +
> > +void __attribute__ ((weak))
> > +arch_kimage_file_post_load_cleanup(struct kimage *image)
> > +{
> > +	return;
> > +}
> > +
> 
> 
> 
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
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