ring_buffer_subbuf_order_set() checks for resize_disabled twice under
the same buffer->mutex hold. Moreover, this check duplicates the logic
in ring_buffer_resize(). Create a common helper rb_resize_disabled() to
factor out this code and drop redundant checks.

Additionally, remove the unnecessary cpumask_test_cpu() in
ring_buffer_subbuf_order_set() as for_each_buffer_cpu() already
iterates over buffer->cpumask.

v2:
  - Split cpumask_test_cpu() cleanup into its own patch (Steven)
  - Remove another unnecessary cpumask_test_cpu() (David)

v1: https://lore.kernel.org/all/20260914175907.1027349-1-vdonnefort@google.com/

Vincent Donnefort (2):
  ring-buffer: Clean up resize_disabled checks
  ring-buffer: Remove unnecessary cpumask_test_cpu

 kernel/trace/ring_buffer.c | 70 +++++++++++++++-----------------------
 1 file changed, 28 insertions(+), 42 deletions(-)


base-commit: fd73f4a6659897191fa0d40695fe370925dd3780
-- 
2.55.0.1082.g2b9226bbc0-goog