[RFC PATCH v2 00/10] Enable CONFIG_VMAP_STACK on PPC32

[Christophe Leroy]

The purpose of this serie is to enable CONFIG_VMAP_STACK on PPC32.

For the time being we have something working on 8xx.

Further work I'm working on:
- Fix stack overflow detection (doesn't work all the time yet, with the LKDTM STACK_EXHAUST test it hang).
- Add support to powerpc 603
- Add support to all book3s32

v2: added stack overflow detection.

Christophe Leroy (10):
  powerpc/32: replace MTMSRD() by mtmsr
  powerpc/32: Add EXCEPTION_PROLOG_0 in head_32.h
  powerpc/32: prepare for CONFIG_VMAP_STACK
  powerpc/8xx: Use alternative scratch registers in DTLB miss handler
  powerpc/8xx: drop exception entries for non-existing exceptions
  powerpc/8xx: move DataStoreTLBMiss perf handler
  powerpc/8xx: split breakpoint exception
  powerpc/8xx: Enable CONFIG_VMAP_STACK
  powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK
  powerpc/32: Add stack overflow detection with VMAP stack.

 arch/powerpc/Kconfig                   |   1 +
 arch/powerpc/include/asm/processor.h   |   5 ++
 arch/powerpc/include/asm/thread_info.h |  18 ++++
 arch/powerpc/kernel/asm-offsets.c      |   5 ++
 arch/powerpc/kernel/entry_32.S         |  37 +++++++--
 arch/powerpc/kernel/head_32.S          |   4 +-
 arch/powerpc/kernel/head_32.h          |  98 ++++++++++++++++++++--
 arch/powerpc/kernel/head_8xx.S         | 145 ++++++++++++++++++---------------
 arch/powerpc/kernel/setup_32.c         |   2 +-
 arch/powerpc/kernel/setup_64.c         |   2 +-
 arch/powerpc/kernel/vmlinux.lds.S      |   2 +-
 arch/powerpc/perf/8xx-pmu.c            |  12 ++-
 12 files changed, 240 insertions(+), 91 deletions(-)

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2.13.3