tracing: Separate hist state updates from hist registration
hist_register_trigger() handles both new hist registration as well as existing hist registration through event_command.reg(). Adding a new function, existing_hist_update_only(), that checks and updates existing histograms and exits after doing so allows the confusing logic in event_hist_trigger_parse() to be simplified. Link: https://lkml.kernel.org/r/211b2cd3e3d7e00f4f8ad45ef8b33063da6a7e05.1644010576.git.zanussi@kernel.org Signed-off-by:Tom Zanussi <zanussi@kernel.org> Signed-off-by:
Steven Rostedt (Google) <rostedt@goodmis.org>
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