Steven Rostedt (VMware) 785888c544 ring-buffer: Have rb_iter_head_event() handle concurrent writer
Have the ring_buffer_iter structure have a place to store an event, such
that it can not be overwritten by a writer, and load it in such a way via
rb_iter_head_event() that it will return NULL and reset the iter to the
start of the current page if a writer updated the page.

Link: http://lkml.kernel.org/r/20200317213416.306959216@goodmis.org

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-03-19 19:11:19 -04:00
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