[PATCH V3 00/13] POWER DSCR fixes, improvements, docs and tests

[Anshuman Khandual]

	This patch series has patches for POWER DSCR fixes, improvements,
in code documentaion, kernel support user documentation and selftest based
test cases. It has got five test cases which are derived from Anton's DSCR
test bucket which can be listed as follows.

(1) http://ozlabs.org/~anton/junkcode/dscr_default_test.c
(2) http://ozlabs.org/~anton/junkcode/dscr_explicit_test.c
(3) http://ozlabs.org/~anton/junkcode/dscr_inherit_exec_test.c
(4) http://ozlabs.org/~anton/junkcode/dscr_inherit_test.c
(5) http://ozlabs.org/~anton/junkcode/user_dscr_test.c

So the derivied test cases have Anton's copyright along with mine but the
commit message as of now has only my signed-off-by statement. As Anton
mentioned before he would put his signed-off-by after reviewing these
modified test cases.

NOTE1: Anton's original inherit exec test expected the child to have system
default DSCR value instead of the inherited DSCR value from it's parent.
But looks like thats not the case when we execute the test, it always
inherits it's parent's DSCR value over the exec call as well. So I have
changed the test program assuming its correct to have the inherited DSCR
value in the fork/execed child program. Please let me know if thats not
correct and I am missing something there.

Changes in V3:
-------------
- Minor changes to last couple of sysfs test cases
- Added .gitignore file for the new test directory

Changes in V2: (https://lkml.org/lkml/2015/1/13/148)
-------------
- Updated the thread struct DSCR value inside mtspr facility exception path
- Modified the in code documentation to follow the kernel-doc format
- Added seven selftest based DSCR related test cases under powerpc

Original V1:
------------
- Posted here at https://patchwork.ozlabs.org/patch/418583/

Anshuman Khandual (13):
  powerpc: Fix handling of DSCR related facility unavailable exception
  powerpc, process: Remove the unused extern dscr_default
  powerpc, offset: Change PACA_DSCR to PACA_DSCR_DEFAULT
  powerpc, dscr: Added some in-code documentation
  documentation, powerpc: Add documentation for DSCR support
  selftests, powerpc: Add test for system wide DSCR default
  selftests, powerpc: Add test for explicitly changing DSCR value
  selftests, powerpc: Add test for DSCR SPR numbers
  selftests, powerpc: Add test for DSCR value inheritence across fork
  selftests, powerpc: Add test for DSCR inheritence across fork & exec
  selftests, powerpc: Add test for all DSCR sysfs interfaces
  selftests, powerpc: Add thread based stress test for DSCR sysfs interfaces
  selftests, powerpc: Add gitignore file for the new DSCR tests

 Documentation/powerpc/00-INDEX                     |   2 +
 Documentation/powerpc/dscr.txt                     |  83 ++++++++++++++
 arch/powerpc/include/asm/processor.h               |   9 ++
 arch/powerpc/kernel/asm-offsets.c                  |   2 +-
 arch/powerpc/kernel/entry_64.S                     |   2 +-
 arch/powerpc/kernel/process.c                      |   2 -
 arch/powerpc/kernel/sysfs.c                        |  38 +++++++
 arch/powerpc/kernel/tm.S                           |   4 +-
 arch/powerpc/kernel/traps.c                        |  45 +++++++-
 arch/powerpc/kvm/book3s_hv_rmhandlers.S            |   2 +-
 tools/testing/selftests/powerpc/Makefile           |   2 +-
 tools/testing/selftests/powerpc/dscr/.gitignore    |   7 ++
 tools/testing/selftests/powerpc/dscr/Makefile      |  19 ++++
 tools/testing/selftests/powerpc/dscr/dscr.h        | 120 ++++++++++++++++++++
 .../selftests/powerpc/dscr/dscr_default_test.c     | 121 +++++++++++++++++++++
 .../selftests/powerpc/dscr/dscr_explicit_test.c    |  72 ++++++++++++
 .../powerpc/dscr/dscr_inherit_exec_test.c          | 118 ++++++++++++++++++++
 .../selftests/powerpc/dscr/dscr_inherit_test.c     |  96 ++++++++++++++++
 .../selftests/powerpc/dscr/dscr_sysfs_test.c       |  92 ++++++++++++++++
 .../powerpc/dscr/dscr_sysfs_thread_test.c          | 116 ++++++++++++++++++++
 .../selftests/powerpc/dscr/dscr_user_test.c        |  62 +++++++++++
 21 files changed, 1001 insertions(+), 13 deletions(-)
 create mode 100644 Documentation/powerpc/dscr.txt
 create mode 100644 tools/testing/selftests/powerpc/dscr/.gitignore
 create mode 100644 tools/testing/selftests/powerpc/dscr/Makefile
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr.h
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_default_test.c
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_explicit_test.c
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_inherit_exec_test.c
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_inherit_test.c
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_sysfs_thread_test.c
 create mode 100644 tools/testing/selftests/powerpc/dscr/dscr_user_test.c

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1.9.3