[PATCH 11/12] kexec: allow architectures to override boot mapping

[Russell King - ARM Linux]

On Thu, May 12, 2016 at 02:26:27PM +0800, Baoquan He wrote:
> On 04/28/16 at 10:28am, Russell King wrote:
> > diff --git a/include/linux/kexec.h b/include/linux/kexec.h
> > index 52a3a221bcb2..99cb9dac7909 100644
> > --- a/include/linux/kexec.h
> > +++ b/include/linux/kexec.h
> > @@ -318,6 +318,44 @@ int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
> >  int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
> >  					unsigned int relsec);
> >  
> > +#ifndef page_to_boot_pfn
> > +static inline unsigned long page_to_boot_pfn(struct page *page)
> > +{
> > +	return page_to_pfn(page);
> > +}
> > +#endif
> 
> I am thinking if it's appropriate to introduce a new concept which only
> exists in a certain system of a certain ARCH. Is it unavoidable? If have
> to can we name it as kexec_page_to_pfn/kexec_pfn_to_page, etc? People
> might not need to know about boot view physical address and kernel view
> physical address things when they just want to understand kexec
> implementation related to one ARCH except of ARM, even related to ARM
> but not Keystone 2.

Well, what do you suggest we do instead?

Eric, please get involved in this discussion, as this was your idea.

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