[Xen-devel] Re: [RFC PATCH 32/35] Add Xen driver utility functions.

[Andi Kleen <ak@xxxxxxx>]

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.

-Andi

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