[RFC 0/2] Consolidate patch_instruction

[Balbir Singh <bsingharora@gmail.com>]

patch_instruction is enhanced in this RFC to support
patching via a different virtual address (text_poke_area).
The mapping of text_poke_area->addr is RW and not RWX.
This way the mapping allows write for patching and then we tear
down the mapping. The downside is that we introduce a spinlock
which serializes our patching to one patch at a time.

In this patchset we also consolidate instruction changes
in kprobes to use patch_instruction().

Balbir Singh (2):
  powerpc/lib/code-patching: Enhance code patching
  powerpc/kprobes: Move kprobes over to patch_instruction

 arch/powerpc/kernel/kprobes.c    |  4 +-
 arch/powerpc/lib/code-patching.c | 88 ++++++++++++++++++++++++++++++++++++++--
 2 files changed, 86 insertions(+), 6 deletions(-)

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2.9.3