tree fa66bf50b14d305ec2e443cf0c6e1fcaff87b414
parent 5bc55a333a2f7316b58edc7573e8e893f7acb532
author Vincent Donnefort <vdonnefort@google.com> 1736336725 +0000
committer Steven Rostedt (Google) <rostedt@goodmis.org> 1736800790 -0500

ring-buffer: Check for empty ring-buffer with rb_num_of_entries()

Currently there are two ways of identifying an empty ring-buffer. One
relying on the current status of the commit / reader page
(rb_per_cpu_empty()) and the other on the write and read counters
(rb_num_of_entries() used in rb_get_reader_page()).

with rb_num_of_entries(). This intends to ease later
introduction of ring-buffer writers which are out of the kernel control
and with whom, the only information available is through the meta-page
counters.

Link: https://lore.kernel.org/20250108114536.627715-2-vdonnefort@google.com
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>