linux-kernel - Re: [PATCH 04/11] tracing: fix disabling of soft disable

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Date:	Mon, 01 Jul 2013 20:38:15 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Tom Zanussi <tom.zanussi@...el.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/11] tracing: fix disabling of soft disable

(2013/06/22 14:25), Tom Zanussi wrote:
> 
> Looking into this a bit more, I think the reason it hasn't bothered
> anyone until now is that it's been hidden by the existing
> event_enable_read() implementation, which doesn't show any soft disable
> state when the event is actually disabled, only when it's enabled.  So
> the case where SOFT_DISABLED is still set but the event is actually
> disabled gets hidden by the catch-all "0" case.
> 
> My new version of event_enable_read() does show the soft disabled state
> when the event is actually disabled, which is why I noticed it wasn't
> getting turned off, and led to the current patch.
> 
> Ironically, the reason I refactored the function in the first place was
> to add the '+' flag for triggers - redundant, yes, but useful for
> debugging, not quite in the way I planned though.  ;-)  (It might be
> that leaving the current function in place and remaining oblivious would
> be ok, too, since it doesn't seem to really cause much of a problem in
> any case...)
> 

Ah, I've just missed this. And indeed, if your event_enable_read() cleanup
patch changes the output, that is not actual cleanup patch.
I think you should merge this into [1/11] patch to avoid behavior change.

Thank you!

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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