Date: Mon, 17 Nov 2008 17:24:31 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Soeren Sandmann <sandmann@daimi.au.dk>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Kernel Testers List <kernel-testers@vger.kernel.org>,
       Eric Anholt <eric@anholt.net>, Steven Rostedt <rostedt@goodmis.org>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [Bug #11954] sysprof tracer ABI regression in 2.6.28rc1
Message-ID: <20081117162431.GG12081@elte.hu>
References: <VwdsQNEjR_C.A.CiD.9_FIJB@chimera> <Q7OAnAv0V3D.A.MbF.8AGIJB@chimera> <ye8k5b2eetz.fsf@camel11.daimi.au.dk>
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* Soeren Sandmann <sandmann@daimi.au.dk> wrote:

> There are no ABI guarantees for the sysprof tracer at this point, 
> given that it is in debugfs [...]

to avoid situations like this, it would be nice to print out the 
format string itself in the trace header, in printf format string 
style. That way if there's a trivial expansion in trace format, it can 
be detected (and even followed) by user-space - without some ugly 
version based API.

	Ingo
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