ABI: update files to reduce the documentation gap

On a recent work, "scripts/get_abi.pl" gained a command that validates if the files under /sys are properly described inside Documentation/ABI.

It does that by comparing the What: fields inside Documentation/ABI with the entries under /sysfs.

This series addresses some of the most commonly missed nodes (in terms of the number of reported occurencies).

This series is based on next-20210927. Most patches are independent from the other patches on this series.

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After this series, the number of warnings reduced a lot on my desktop (a NUC8i7HNK):

  $  time ./scripts/get_abi.pl undefined |sort >undef && cat undef|perl -ne 'print "$1\n" if (m#.*/(\S+) not found#)'|sort|uniq -c|sort -nr >undefined_symbols &&  wc -l undef undefined_symbols
  real	0m6,583s
  user	0m5,841s
  sys	0m0,718s
    6663 undef
     774 undefined_symbols
    7437 total

Please notice that this script runs millions of regular expressions in order to do such match. So, while here is is running on 6 seconds, it could take a lot more time on a bigger machine.

Mauro Carvalho Chehab (17):
ABI: stable/sysfs-module: better document modules
ABI: stable/sysfs-module: document version and srcversion
ABI: testing/sysfs-module: document initstate
ABI: sysfs-devices-power: document some RPM statistics
ABI: sysfs-devices: add /dev ABI
ABI: sysfs-bus-pci: add documentation for modalias
ABI: o2cb: add an obsolete file for /sys/o2cb
ABI: sysfs-kernel-slab: Document some stats
ABI: sysfs-devices-power: add some debug sysfs files
ABI: sysfs-bus-pci: add a alternative What fields
ABI: sysfs-class-bdi: use What: to describe each property
ABI: sysfs-bus-mdio: add alternate What for mdio symbols
ABI: sysfs-bus-usb: use a wildcard for interface name on What
ABI: sysfs-bus-usb: add missing sysfs fields
ABI: obsolete/sysfs-bus-iio: add some missing blank lines
ABI: sysfs-driver-ufs: Add another What for platform drivers
ABI: sysfs-bus-platform: add modalias description

 Documentation/ABI/obsolete/o2cb               |  11 +
 Documentation/ABI/obsolete/sysfs-bus-iio      |   4 +
 Documentation/ABI/stable/o2cb                 |   2 +-
 Documentation/ABI/stable/sysfs-devices        |   7 +
 Documentation/ABI/stable/sysfs-module         |  25 +-
 Documentation/ABI/testing/sysfs-bus-mdio      |   9 +
 Documentation/ABI/testing/sysfs-bus-pci       |  22 ++
 Documentation/ABI/testing/sysfs-bus-platform  |  12 +
 Documentation/ABI/testing/sysfs-bus-usb       | 276 +++++++++++++++++-
 Documentation/ABI/testing/sysfs-class-bdi     |  30 +-
 Documentation/ABI/testing/sysfs-devices-power |  36 +++
 Documentation/ABI/testing/sysfs-driver-ufs    | 126 ++++++++
 Documentation/ABI/testing/sysfs-kernel-slab   |  21 ++
 Documentation/ABI/testing/sysfs-module        |   7 +
 14 files changed, 571 insertions(+), 17 deletions(-)
 create mode 100644 Documentation/ABI/obsolete/o2cb

2.31.1