[RFC PATCH v2 0/6] powerpc: Support context tracking for Power pSeries

[Li Zhong <zhong@linux.vnet.ibm.com>]

These patches try to support context tracking for Power arch, beginning with
64-bit pSeries. The codes are ported from that of the x86_64, and in each
patch, I listed the corresponding patch for x86.

Would you please help review and give your comments?

v2:

I rebased the patches against 3.9-rcs, and also added a patch to replace
the exception handling with the generic code in tip timers/nohz.

I assume these patches would get in through powerpc tree, so I didn't combine
the new patch (#6) with the original one (#2). So that if powerpc tree picks
these, it could pick the first five patches, and apply patch #6 later
when the dependency enters into powerpc tree (maybe on some 3.10-rcs).

I'm also wondering whether it is possible for these to go through
tip timers/nohz, so for now, patches #6 and #2 could be combined into one, and
no need to  worry about the issues caused by arch/common code merging. And it
might also make future changes easier.

Thanks, Zhong

Li Zhong (6):
  powerpc: Syscall hooks for context tracking subsystem
  powerpc: Exception hooks for context tracking subsystem
  powerpc: Exit user context on notify resume
  powerpc: Use the new schedule_user API on userspace preemption
  powerpc: select HAVE_CONTEXT_TRACKING for pSeries
  powerpc: Use generic code for exception handling

 arch/powerpc/include/asm/context_tracking.h |   10 +++
 arch/powerpc/include/asm/thread_info.h      |    7 ++-
 arch/powerpc/kernel/entry_64.S              |    3 +-
 arch/powerpc/kernel/ptrace.c                |    5 ++
 arch/powerpc/kernel/signal.c                |    5 ++
 arch/powerpc/kernel/traps.c                 |   91 ++++++++++++++++++++-------
 arch/powerpc/mm/fault.c                     |   16 ++++-
 arch/powerpc/mm/hash_utils_64.c             |   38 ++++++++---
 arch/powerpc/platforms/pseries/Kconfig      |    1 +
 9 files changed, 140 insertions(+), 36 deletions(-)
 create mode 100644 arch/powerpc/include/asm/context_tracking.h

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1.7.9.5