linux-kernel - Re: [tip:tracing/urgent] tracing: Fix event format export

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Message-ID: <20091203145504.GA959@elte.hu>
Date:	Thu, 3 Dec 2009 15:55:04 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	johannes@...solutions.net, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:tracing/urgent] tracing: Fix event format export


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Sat, 2009-11-14 at 10:18 +0000, tip-bot for Johannes Berg wrote:
> > Commit-ID:  811cb50baf63461ce0bdb234927046131fc7fa8b
> > Gitweb:     http://git.kernel.org/tip/811cb50baf63461ce0bdb234927046131fc7fa8b
> > Author:     Johannes Berg <johannes@...solutions.net>
> > AuthorDate: Fri, 13 Nov 2009 23:40:09 +0100
> > Committer:  Steven Rostedt <rostedt@...dmis.org>
> > CommitDate: Fri, 13 Nov 2009 22:20:34 -0500
> > 
> > tracing: Fix event format export
> > 
> > For some reason the export of the event print format to userspace
> > uses '#fmt' which breaks if the format string is anything but a plain
> > string, for example if it is built with macros then the macro names
> > are exported instead of their contents.
> > 
> > Use
> > 	"\"%s\"", fmt
> > instead of
> > 	"%s", #fmt
> > to export the string and not the way it is built.
> > 
> > For example, in net/mac80211/driver-trace.h for the trace event drv_start
> > there is:
> > 
> >         TP_printk(
> >                 LOCAL_PR_FMT, LOCAL_PR_ARG
> >         )
> > 
> > Which use to produce:
> > 
> >  print fmt: LOCAL_PR_FMT, REC->wiphy_name
> > 
> > Now produces:
> > 
> >  print fmt: "%s", REC->wiphy_name
> > 
> > Signed-off-by: Johannes Berg <johannes@...solutions.net>
> > LKML-Reference: <20091113224009.GB23942@...e.hu>
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> 
> Ingo,
> 
> Any reason that this did not make it into Mainline? 2.6.32 is out, and 
> Johannes Berg was depending on this for his users.

Yeah, it narrowly missed the last -rc (-rc8), and we only push 
post-final-rc fixes for serious show-stopper regressions.

v2.6.32.1 will have this (and other) fixes. Johannes can cherry-pick the 
fix in a day or so once it hits Linus's tree in the merge window.

Thanks,

	Ingo
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