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

[Vincent Donnefort]

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

Changelog:

v2:

  - 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@xxxxxxxxxx/

Vincent Donnefort (6):
  ring-buffer: Prevent resizing of persistent ring buffer
  ring-buffer: Prevent subbuf order change when resizing is disabled
  ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer()
  ring-buffer: Fix subbuf resize concurrency
  ring-buffer: Dynamically calculate max_data_size
  ring-buffer: Remove ring_buffer_per_cpu::mapped

 kernel/trace/ring_buffer.c | 216 ++++++++++++++++++++-----------------
 1 file changed, 117 insertions(+), 99 deletions(-)


base-commit: 075b74841bd0065a3bda3440873c747938e69b68
-- 
2.55.0.654.g21b8a5bc05-goog