[patch 0/5] access_process_vm device memory access

[Rik van Riel]

In order to be able to debug things like the X server and programs
using the PPC Cell SPUs, the debugger needs to be able to access
device memory through ptrace and /proc/pid/mem.

Changelog:
 - use CONFIG_HAVE_IOREMAP_PROT
 - do not use generic_access_phys as a fallback but define it in
   the ->vm_ops->access for appropriate VMAs
 - other code cleanups suggested by Andrew Morton and Sam Ravnborg

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