[Crash-utility] [RFC PATCH 0/1] support lockless printk ringbuffer

[John Ogness]

Hi Kazu,

Here is a patch adding full support for the new lockless printk
ringbuffer as it is currently being proposed. Note that the latest
version has not yet been submitted to LKML. I was waiting until I
finished tests with crash(8) and makedumpfile(8).

The new ringbuffer will export all the necessary symbols, sizes,
and offsets in VMCOREINFO.

Note that I created a separate printk.c for the iteration logic.

Also note that I modified dwarf_info.c to support resolving
typedefs of typedefs. This was necessary in order to support
atomic_long_t and its "counter" member.

I don't expect you to take the patch as-is, but I hope it can
provide some positive ground work for moving forward.

John Ogness (1):
  printk: add support for lockless ringbuffer

 Makefile       |   2 +-
 dwarf_info.c   |  36 +++++++++-
 makedumpfile.c | 101 ++++++++++++++++++++++++++--
 makedumpfile.h |  25 +++++++
 printk.c       | 177 +++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 333 insertions(+), 8 deletions(-)
 create mode 100644 printk.c

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2.20.1