[PATCH v6 0/6] reorganize and add FADump sysfs files

[Sourabh Jain]

Currently, FADump sysfs files are present inside /sys/kernel directory.
But as the number of FADump sysfs file increases it is not a good idea to
push all of them in /sys/kernel directory. It is better to have separate
directory to keep all the FADump sysfs files.

Patch series reorganizes the FADump sysfs files and avail all the existing
FADump sysfs files present inside /sys/kernel into a new directory
/sys/kernel/fadump. The backward compatibility is maintained by adding a
symlink for every sysfs file that has moved to new location. Also a new
FADump sys interface is added to get the amount of memory reserved by FADump
for saving the crash dump.

Changelog:
v1 -> v5:
  - https://lists.ozlabs.org/pipermail/linuxppc-dev/2019-December/201642.html

v5 -> v6
  - Unregister FADump if fadump group creation fails.
  - Remove fadump_enabled symlink if fadump_registered symlink
    creation fails.
  - Removed CREATE_SYMLINK macro.

Sourabh Jain (6):
  Documentation/ABI: add ABI documentation for /sys/kernel/fadump_*
  sysfs: wrap __compat_only_sysfs_link_entry_to_kobj function to change
    the symlink name
  powerpc/fadump: reorganize /sys/kernel/fadump_* sysfs files
  powerpc/powernv: move core and fadump_release_opalcore under new
    kobject
  Documentation/ABI: mark /sys/kernel/fadump_* sysfs files deprecated
  powerpc/fadump: sysfs for fadump memory reservation

 .../ABI/obsolete/sysfs-kernel-fadump_enabled  |   9 ++
 .../obsolete/sysfs-kernel-fadump_registered   |  10 ++
 .../obsolete/sysfs-kernel-fadump_release_mem  |  10 ++
 .../sysfs-kernel-fadump_release_opalcore      |   9 ++
 Documentation/ABI/testing/sysfs-kernel-fadump |  40 ++++++
 .../powerpc/firmware-assisted-dump.rst        |  28 +++-
 arch/powerpc/kernel/fadump.c                  | 127 +++++++++++++-----
 arch/powerpc/platforms/powernv/opal-core.c    |  55 +++++---
 fs/sysfs/group.c                              |  28 +++-
 include/linux/sysfs.h                         |  12 ++
 10 files changed, 270 insertions(+), 58 deletions(-)
 create mode 100644 Documentation/ABI/obsolete/sysfs-kernel-fadump_enabled
 create mode 100644 Documentation/ABI/obsolete/sysfs-kernel-fadump_registered
 create mode 100644 Documentation/ABI/obsolete/sysfs-kernel-fadump_release_mem
 create mode 100644 Documentation/ABI/removed/sysfs-kernel-fadump_release_opalcore
 create mode 100644 Documentation/ABI/testing/sysfs-kernel-fadump

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2.17.2