[PATCH 0/6] ring-buffer: Fixes for subbuf resizing and persistent buffers

[Vincent Donnefort <vdonnefort@google.com>]

This series addresses multiple issues discovered with the dynamic ring
buffer resizing.

Changelog:

v3:

  - Drop first 3 patches (Rebased on 7.2-rc7)
  - Add a patch to align "nr_pages" to unsigned int
  - Add a patch to remove useless trace_buffer::cpus
  - Add unsigned long cast for rb_subbuf_size()
  - subbuf_order fix for rb_free_cpu_buffer() (Sashiko)
  - Use __always_inline just like the other accessors for the hot-path.

v2 (https://lore.kernel.org/all/20260806211306.3704194-1-vdonnefort@google.com/):

  - Prevent resizing of the persistent ring buffer
  - Add missing bpage::order init
  - Rework subbuf_size/subbuf_order (Sashiko)
  - Remove ring_buffer_per_cpu::mapped
  - Dynamically calculate trace_buffer::max_data_size

v1 (https://lore.kernel.org/all/20260805153225.2096152-1-vdonnefort@google.com/

Vincent Donnefort (6):
  ring-buffer: Fix subbuf resize concurrency
  ring-buffer: Dynamically calculate max_data_size
  ring-buffer: Free cpu_buffer->free_page with subbuf_order
  ring-buffer: Remove trace_buffer::cpus
  ring-buffer: Remove ring_buffer_per_cpu::mapped
  ring-buffer: Make nr_pages unsigned int

 kernel/trace/ring_buffer.c | 259 +++++++++++++++++++------------------
 1 file changed, 136 insertions(+), 123 deletions(-)


base-commit: db2ddb87143519e20a95aa36c60b36107b736a58
-- 
2.55.0.654.g21b8a5bc05-goog