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    SubjectRe: [patch 1/5] access_process_vm device memory infrastructure
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    On Thu, 2008-05-15 at 13:53 -0400, Rik van Riel wrote:
    > plain text document attachment
    > (01-access_process_vm-device-memory.patch)
    > Add the generic_access_phys access function and put the hooks in place
    > to allow access_process_vm to access device or PPC Cell SPU memory.
    >
    > Signed-off-by: Rik van Riel <riel@redhat.com>
    > Signed-off-by: Benjamin Herrensmidt <benh@kernel.crashing.org>
    >

    > Index: ptrace-2.6.26-rc2-mm1/include/linux/mm.h
    > ===================================================================
    > --- ptrace-2.6.26-rc2-mm1.orig/include/linux/mm.h 2008-05-15 13:50:13.000000000 -0400
    > +++ ptrace-2.6.26-rc2-mm1/include/linux/mm.h 2008-05-15 13:50:18.000000000 -0400
    > @@ -169,6 +169,12 @@ struct vm_operations_struct {
    > /* notification that a previously read-only page is about to become
    > * writable, if an error is returned it will cause a SIGBUS */
    > int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
    > +
    > + /* called by access_process_vm when get_user_pages() fails, typically
    > + * for use by special VMAs that can switch between memory and hardware
    > + */
    > + int (*access)(struct vm_area_struct *vma, unsigned long addr,
    > + void *buf, int len, int write);


    This bit misses corresponding Documentation/ changes.

    Other than that it looks good.

    Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>



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