[PATCH 0/6] powerpc: SMT priority (PPR) save and restore

[Haren Myneni]

On P7 systems, users can define SMT priority levels 2,3 and 4 for
processes so that some can run higher priority than the other ones.
In the current kernel, the default priority is set to 4 which prohibits
processes for using higher priority. Also the kernel boosts the priority to
4 during exceptions without saving the user defined priorities when
the task enters the kernel. So we will be loosing the process PPR value
and can not be restored it back when the task exits the kernel.

This patch set implements saving and restore the user defined PPR value
for all tasks.

Haren Myneni (6):
  powerpc: Move branch instruction from ACCOUNT_CPU_USER_ENTRY to caller
  powerpc: Add enable_ppr kernel parameter to enable PPR save/restore
  powerpc: Add ppr in thread_info struct
  powerpc: Increase exceptions arrays in paca struct to save PPR
  powerpc: Macros for saving/restore PPR
  powerpc: Implement PPR save/restore

 Documentation/kernel-parameters.txt      |    4 +++
 arch/powerpc/include/asm/cputable.h      |    6 ++--
 arch/powerpc/include/asm/exception-64s.h |   51 ++++++++++++++++++++++++++----
 arch/powerpc/include/asm/paca.h          |    6 ++--
 arch/powerpc/include/asm/ppc_asm.h       |    2 --
 arch/powerpc/include/asm/reg.h           |    1 +
 arch/powerpc/include/asm/thread_info.h   |   11 +++++++
 arch/powerpc/kernel/asm-offsets.c        |    1 +
 arch/powerpc/kernel/entry_64.S           |    7 +++-
 arch/powerpc/kernel/exceptions-64s.S     |   18 ++++++-----
 arch/powerpc/kernel/setup_64.c           |   14 ++++++++
 11 files changed, 99 insertions(+), 22 deletions(-)

-- 
1.7.10.4