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    SubjectRe: [RFC PATCH 32/35] Add Xen driver utility functions.
    On Tuesday 09 May 2006 09:00, Chris Wright wrote:
    > Allocate/destroy a 'vmalloc' VM area: alloc_vm_area and free_vm_area
    > The alloc function ensures that page tables are constructed for the
    > region of kernel virtual address space and mapped into init_mm.
    > Lock an area so that PTEs are accessible in the current address space:
    > lock_vm_area and unlock_vm_area
    > The lock function prevents context switches to a lazy mm that doesn't
    > have the area mapped into its page tables. It also ensures that the
    > page tables are mapped into the current mm by causing the page fault
    > handler to copy the page directory pointers from init_mm into the
    > current mm.

    Having that in drivers/xen looks wrong. It should be probably somewhere generic.

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