Merge tag 'trace-ringbuffer-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull ring-buffer updates from Steven Rostedt:

 - Add Vincent Donnefort as ring-buffer maintainer

   Vincent has been doing a lot of updates to the ftrace ring buffer
   lately. I'm going to start delegating updates for the ring buffer to
   him.

 - Use RING_BUFFER_MIN_NR_PAGES instead of open coding the number 2

   Instead of using the number 2 as the minimum number of pages that a
   ring buffer may have, create and use a macro
   RING_BUFFER_MIN_NR_PAGES.

 - Clean up the resize_disabled_checks

   There's duplication of code to check for resize disabled. Create a
   helper function rb_resize_disabled() and use that. Not only does it
   put the code in one place, it also removed a redundant check.

 - Remove unnecessary cpumask_test_cpu checks

   The loop for_each_buffer_cpu(buffer, cpu) only loops over CPUs in the
   buffer->cpumask. There's no reason to test if the CPU is set in that
   same loop.

 - Take cpus_read_lock() when changing the subbuf order

   A CPU coming on line for the first time allocates its CPU buffer. But
   if this happens while the subbuffer is being resized, it can cause an
   inconsistent state of subbufer sizes in the buffer. Add a
   cpus_read_lock() to ring_buffer_subbuf_order_set() to prevent this
   race.

* tag 'trace-ringbuffer-v7.4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Take cpus_read_lock() when changing the subbuf order
  ring-buffer: Remove unnecessary cpumask_test_cpu
  ring-buffer: Clean up resize_disabled checks
  ring-buffer: Unify ring buffer minimum page calculations
  ring-buffer: Add a MAINTAINERS category specific for the tracing ring-buffer

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