[PATCH v4 0/16] Merge ram_console into pstore, and more

[Anton Vorontsov <anton.vorontsov@linaro.org>]

Hi all,

A brand new v4:

- Per Kees Cook's comments, the patches no longer remove an automatic
  updates feature, but instead make the it configurable; plus disable
  it by default (in a separate patch);
- Fixed some bugs noticed by Colin Cross;
- Documented new continuous ramoops-console log behaviour (also
  noticed by Colin Cross).

In v3:

- Rebased on top of current staging-next;
- The series are getting bigger. This is partly because we now support
  different persistent zone sizes for oops records and console log,
  per Colin Cross' request.
  And I believe the code is now more manageable for further enhancements
  (e.g. if we'd want to add other message types, e.g. tracing);
- Addressed Kees Cook's comments on the unlinking matters;
- Removed automatic updates support. Please see the last patch
  description for rationale;
- A new fixup for pstore/inode, just getting rid of a sparse warning.

In v2:

- Updated documentation per Colin Cross' comments;
- Corrected return value in ramoops_pstore_write() (noticed by Kees Cook);
- Fixed large writes handling in pstore_console_write(), i.e. when
  log_buf write is larger than pstore bufsize. Also Noticed by Kees Cook.


And a boilerplate for the series:

Currently pstore doesn't support logging kernel messages in run-time,
it only dumps dmesg when kernel oopses/panics. This makes pstore
useless for debugging hangs caused by HW issues or improper use of HW
(e.g. weird device inserted -> driver tried to write reserved bits ->
SoC hanged. In that case we don't get any messages in the pstore.

This series add a new message type for pstore, i.e. PSTORE_TYPE_CONSOLE,
plus make pstore/ram.c handle the new messages.

The old ram_console driver is removed. This might probably cause
some pain for out-of-tree code, as it would need to be adjusted...
but "no pain, no gain"? :-) Though, if there's some serious resistance,
we can probably postpone the last two patches.

Thanks!

--- 
 Documentation/ramoops.txt             |   14 ++
 drivers/staging/android/Kconfig       |    5 -
 drivers/staging/android/Makefile      |    1 -
 drivers/staging/android/ram_console.c |  179 --------------------------
 fs/pstore/Kconfig                     |    7 +
 fs/pstore/inode.c                     |    5 +-
 fs/pstore/platform.c                  |   49 ++++++-
 fs/pstore/ram.c                       |  228 ++++++++++++++++++++++++++-------
 fs/pstore/ram_core.c                  |  108 +++-------------
 include/linux/pstore.h                |    1 +
 include/linux/pstore_ram.h            |   22 +---
 11 files changed, 272 insertions(+), 347 deletions(-)

-- 
Anton Vorontsov
Email: cbouatmailru@gmail.com