[PATCH v18 0/8] ring-buffer: Making persistent ring buffers robust

[Masami Hiramatsu (Google)]

Hi,

Here is the 18th version of improvement patches for making persistent
ring buffers robust to failures.
The previous version is here:

https://lore.kernel.org/all/177687458572.932171.10907864814735342737.stgit@mhiramat.tok.corp.google.com/

This version fixes a newly found bug and some review comments from
Sashiko[1], also, add 2 cleanups, which includes:
[1/8] Do not double count the reader_page when verifying persistent
      ring buffer.
[2/8] Add Geert's Ack (Thanks!)
[3/8] Fix to substract BUF_PAGE_HDR_SIZE from meta->subbuf_size
      to make the limit of commit size.
[4/8] Reset timestamp of reader_page when the entire cpu_buffer is
      invalid.
[5/8] In rb_test_inject_invalid_pages(), changed entry_bytes and
      idx to unsigned long.
[7/8] Cleanup persistent ring buffer validation code.
[8/8] Cleanup buffer_data_page related code.

[1] https://sashiko.dev/#/patchset/177687458572.932171.10907864814735342737.stgit%40mhiramat.tok.corp.google.com

Thank you,

Masami Hiramatsu (Google) (8):
      ring-buffer: Do not double count the reader_page
      ring-buffer: Flush and stop persistent ring buffer on panic
      ring-buffer: Skip invalid sub-buffers when validating persistent ring buffer
      ring-buffer: Skip invalid sub-buffers when rewinding persistent ring buffer
      ring-buffer: Add persistent ring buffer invalid-page inject test
      ring-buffer: Show commit numbers in buffer_meta file
      ring-buffer: Cleanup persistent ring buffer validation
      ring-buffer: Cleanup buffer_data_page related code


 arch/alpha/include/asm/Kbuild        |    1 
 arch/arc/include/asm/Kbuild          |    1 
 arch/arm/include/asm/Kbuild          |    1 
 arch/arm64/include/asm/ring_buffer.h |   10 +
 arch/csky/include/asm/Kbuild         |    1 
 arch/hexagon/include/asm/Kbuild      |    1 
 arch/loongarch/include/asm/Kbuild    |    1 
 arch/m68k/include/asm/Kbuild         |    1 
 arch/microblaze/include/asm/Kbuild   |    1 
 arch/mips/include/asm/Kbuild         |    1 
 arch/nios2/include/asm/Kbuild        |    1 
 arch/openrisc/include/asm/Kbuild     |    1 
 arch/parisc/include/asm/Kbuild       |    1 
 arch/powerpc/include/asm/Kbuild      |    1 
 arch/riscv/include/asm/Kbuild        |    1 
 arch/s390/include/asm/Kbuild         |    1 
 arch/sh/include/asm/Kbuild           |    1 
 arch/sparc/include/asm/Kbuild        |    1 
 arch/um/include/asm/Kbuild           |    1 
 arch/x86/include/asm/Kbuild          |    1 
 arch/xtensa/include/asm/Kbuild       |    1 
 include/asm-generic/ring_buffer.h    |   13 +
 include/linux/ring_buffer.h          |    1 
 kernel/trace/Kconfig                 |   34 ++
 kernel/trace/ring_buffer.c           |  472 +++++++++++++++++++++++-----------
 kernel/trace/trace.c                 |    4 
 26 files changed, 395 insertions(+), 159 deletions(-)
 create mode 100644 arch/arm64/include/asm/ring_buffer.h
 create mode 100644 include/asm-generic/ring_buffer.h


base-commit: 6170922f137231b98fc568571befef63e1edff3f
--
Masami Hiramatsu (Google) <mhiramat at kernel.org>