Re: [patch] mspec - special memory driver and do_no_pfn handler

[Carsten Otte <cotte@de.ibm.com>]

Jes Sorensen wrote:
> Index: linux-2.6/include/linux/mm.h
> ===================================================================
> --- linux-2.6.orig/include/linux/mm.h
> +++ linux-2.6/include/linux/mm.h
> @@ -199,6 +199,7 @@
>  	void (*open)(struct vm_area_struct * area);
>  	void (*close)(struct vm_area_struct * area);
>  	struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int *type);
> +	long (*nopfn)(struct vm_area_struct * area, unsigned long address, int *type);
>  	int (*populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock);
>  #ifdef CONFIG_NUMA
>  	int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
If you use address as parameter to nopfn, it won't work with highmem
on 32bit systems. Alternative would be to use (unsigned long) phys. page
frame number.

Your work in memory.c looks like the right thing to do.
Afaics it will work for xip as well once I figure how to
do COW. Cool stuff :-).

Carsten