Hi,
Sashiko[1] pointed out other problems. Let me review it.
I also found one mistake (not by this series), so I will fix it too.
[1] https://sashiko.dev/#/patchset/177687458572.932171.10907864814735342737.stgit%40mhiramat.tok.corp.google.com
Thanks,
On Thu, 23 Apr 2026 01:16:26 +0900
"Masami Hiramatsu (Google)" <mhiramat@kernel.org> wrote:
> Hi,
>
> Here is the 17th version of improvement patches for making persistent
> ring buffers robust to failures.
> The previous version is here:
>
> https://lore.kernel.org/all/177547105523.259641.14385891517704197263.stgit@mhiramat.tok.corp.google.com/
>
> This version fixes some review comments from Sashiko[1], which
> includes:
> [2/5] Fix to use rb_page_size() of rewound pages for entry_bytes.
> [3/5] - Fix to verify head_page at first before using its timestamp.
> - Reset timestamp if the page is invalid.
> [4/5] - In rb_test_inject_invalid_pages(), changed entry_bytes and
> idx to unsigned long
> - Added NULL checks for cpu_buffer and meta.
> - In allocate_trace_buffer(), added a NULL check for tr->name
> before comparing it with strcmp.
> [5/5] Added NULL check for dpage in rbm_show in ring_buffer.c.
>
> [1] https://sashiko.dev/#/patchset/177552432201.853249.5125045538812833325.stgit%40mhiramat.tok.corp.google.com
>
> Thank you,
>
> Masami Hiramatsu (Google) (5):
> 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
>
>
> 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 | 275 ++++++++++++++++++++++++++--------
> kernel/trace/trace.c | 4
> 26 files changed, 290 insertions(+), 67 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>