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SubjectRe: [PATCH 1/7] Introduce the pagetable_operations and associated helper macros.
On Mon, Feb 19, 2007 at 10:31:34AM -0800, Adam Litke wrote:
> Signed-off-by: Adam Litke <agl@us.ibm.com>
> ---
>
> include/linux/mm.h | 25 +++++++++++++++++++++++++
> 1 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 2d2c08d..a2fa66d 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -98,6 +98,7 @@ struct vm_area_struct {
>
> /* Function pointers to deal with this struct. */
> struct vm_operations_struct * vm_ops;
> + struct pagetable_operations_struct * pagetable_ops;
>
> /* Information about our backing store: */
> unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
> @@ -218,6 +219,30 @@ struct vm_operations_struct {
> };
>
> struct mmu_gather;
> +
> +struct pagetable_operations_struct {
> + int (*fault)(struct mm_struct *mm,
> + struct vm_area_struct *vma,
> + unsigned long address, int write_access);
> + int (*copy_vma)(struct mm_struct *dst, struct mm_struct *src,
> + struct vm_area_struct *vma);
> + int (*pin_pages)(struct mm_struct *mm, struct vm_area_struct *vma,
> + struct page **pages, struct vm_area_struct **vmas,
> + unsigned long *position, int *length, int i);
> + void (*change_protection)(struct vm_area_struct *vma,
> + unsigned long address, unsigned long end, pgprot_t newprot);
> + unsigned long (*unmap_page_range)(struct vm_area_struct *vma,
> + unsigned long address, unsigned long end, long *zap_work);
> + void (*free_pgtable_range)(struct mmu_gather **tlb,
> + unsigned long addr, unsigned long end,
> + unsigned long floor, unsigned long ceiling);
> +};

I don't think adding another operation vector is a good idea. But I'd
rather extend the vma operations vector to deal with all nessecary
buts ubstead if addubg a second one.

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