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Subject[patch 0/5] access_process_vm device memory access
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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