[PATCH 0/2 v3] powerpc: Make ptrace work reliably

[Bharat Bhushan]

From: Bharat Bhushan <bharat.bhushan at freescale.com>

v2->v3
 - Load PACACURRENT immediately after _MSR(r1), and load DBCR0
   just after "beq resume_kernel 
 - Added lat_sysycal results before and after the patch

v1->v2
 - Subject line was missing 0/2, 1/2, 2/2

Bharat Bhushan (2):
  powerpc: debug control and status registers are 32bit
=> This patch makes debug control and status registers as 32bit as they are.
   This does not fix anything

  powerpc: restore dbcr0 on user space exit
=> This patch fixes the ptrace reliability issue. The description is the patch
   describes one of the case where it does not work reliably

 arch/powerpc/include/asm/processor.h |    8 ++++----
 arch/powerpc/kernel/asm-offsets.c    |    1 +
 arch/powerpc/kernel/entry_64.S       |   28 ++++++++++++++++++++++++----
 3 files changed, 29 insertions(+), 8 deletions(-)