[PATCH v4 00/16] Enable CONFIG_VMAP_STACK on PPC32

[Christophe Leroy]

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

rfc v1: initial support on 8xx

rfc v2: added stack overflow detection.

v3:
- Stack overflow detection works, tested with LKDTM STACK_EXHAUST test
- Support for book3s32 added

v4:
- Fixed build failure with CONFIG_KVM (patch 14)
- Fixed boot failure with pmac32_defconfig+VMAP_STACK+KVM (new patch 15)
- Fixed crash with altivec and fpu (patch 16)

Christophe Leroy (16):
  powerpc/32: replace MTMSRD() by mtmsr
  powerpc/32: Add EXCEPTION_PROLOG_0 in head_32.h
  powerpc/32: save DEAR/DAR before calling handle_page_fault
  powerpc/32: move MSR_PR test into EXCEPTION_PROLOG_0
  powerpc/32: add a macro to get and/or save DAR and DSISR on stack.
  powerpc/32: prepare for CONFIG_VMAP_STACK
  powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK
  powerpc/32: Add early stack overflow detection with 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/32s: reorganise DSI handler.
  powerpc/32s: avoid crossing page boundary while changing SRR0/1.
  powerpc/32s: Activate CONFIG_VMAP_STACK

 arch/powerpc/include/asm/irq.h         |   1 +
 arch/powerpc/include/asm/processor.h   |   6 ++
 arch/powerpc/include/asm/thread_info.h |  18 ++++
 arch/powerpc/kernel/asm-offsets.c      |   6 ++
 arch/powerpc/kernel/entry_32.S         |  55 ++++++++--
 arch/powerpc/kernel/fpu.S              |   3 +
 arch/powerpc/kernel/head_32.S          |  65 ++++++++----
 arch/powerpc/kernel/head_32.h          | 129 ++++++++++++++++++++---
 arch/powerpc/kernel/head_40x.S         |   2 +
 arch/powerpc/kernel/head_8xx.S         | 186 +++++++++++++++------------------
 arch/powerpc/kernel/head_booke.h       |   2 +
 arch/powerpc/kernel/head_fsl_booke.S   |   1 +
 arch/powerpc/kernel/irq.c              |   1 +
 arch/powerpc/kernel/setup_32.c         |   3 +-
 arch/powerpc/kernel/setup_64.c         |   2 +-
 arch/powerpc/kernel/traps.c            |  15 ++-
 arch/powerpc/kernel/vector.S           |   3 +
 arch/powerpc/kernel/vmlinux.lds.S      |   2 +-
 arch/powerpc/mm/book3s32/hash_low.S    |  46 +++++---
 arch/powerpc/mm/book3s32/mmu.c         |   9 +-
 arch/powerpc/perf/8xx-pmu.c            |  12 ++-
 arch/powerpc/platforms/Kconfig.cputype |   3 +
 22 files changed, 393 insertions(+), 177 deletions(-)

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2.13.3