[PATCH v3 0/3] pstore: add multi-backend support

[Yuanhe Shu <xiangzao@linux.alibaba.com>]

I have been steadily working but struggled to find a seamlessly
integrated way to implement tty frontend until Guilherme inspired me
that multi-backend and tty frontend are actually two separate entities.
This submission presents the 3rd iteration of my efforts, listing
notable changes form the v1:

1. pstore.backend no longer acts as "registered backend", but "backends
eligible for registration".

2. drop subdir since it will break user space

3. drop tty frontend since I haven't yet devised a satisfactory
implementation strategy

Changes from v2:

1. Fix ftrace.c build error as I did not compile with
CONFIG_PSTORE_FTRACE.

A heartfelt thank you to Kees and Guilherme for your suggestions.
I firmly believe that a tty frontend is crucial for kdump debugging,
and I am still dedicating effort to develop one. Hope in the future I
can accomplish it with deeper comprehension with tty driver :) 

Yuanhe Shu (3):
  pstore: add multi-backend support
  Documentation: adjust pstore backend related document
  tools/testing: adjust pstore backend related selftest

 Documentation/ABI/testing/pstore              |   8 +-
 .../admin-guide/kernel-parameters.txt         |   4 +-
 fs/pstore/ftrace.c                            |  31 ++-
 fs/pstore/inode.c                             |  19 +-
 fs/pstore/internal.h                          |   4 +-
 fs/pstore/platform.c                          | 225 ++++++++++++------
 fs/pstore/pmsg.c                              |  24 +-
 include/linux/pstore.h                        |  29 +++
 tools/testing/selftests/pstore/common_tests   |   8 +-
 .../selftests/pstore/pstore_post_reboot_tests |  65 ++---
 tools/testing/selftests/pstore/pstore_tests   |   2 +-
 11 files changed, 295 insertions(+), 124 deletions(-)

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2.39.3