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.orgSigned-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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