Hi Steve,
I added a fix related this series as the 1st one. It can be merged
independently.
Thanks,
On Fri, 24 Apr 2026 15:51:59 +0900
"Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:
> 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@kernel.org>
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>