linux-kernel - Re: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommand for kprobe-event setup helper

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Message-ID: <4ACE56EE.8060000@redhat.com>
Date:	Thu, 08 Oct 2009 17:17:34 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommand
 for	kprobe-event setup helper

Masami Hiramatsu wrote:
> Add perf probe subcommand for kprobe-event setup helper to perf command.
> This allows user to define kprobe events by C expressions (C line numbers,
> C function names, and C local variables).
>
> Usage
> -----
>   perf probe [<options>] -P 'PROBEDEF' [-P 'PROBEDEF' ...]
>
>      -k, --vmlinux<file>   vmlinux/module pathname
>      -P, --probe<p|r:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]>
>                            probe point definition, where
> 		p:	kprobe probe
> 		r:	kretprobe probe
> 		GRP:	Group name (optional)
> 		NAME:	Event name
> 		FUNC:	Function name
> 		OFFS:	Offset from function entry (in byte)
> 		SRC:	Source code path
> 		LINE:	Line number
> 		ARG:	Probe argument (local variable name or
> 			kprobe-tracer argument format is supported.)

Oops, I found it caused compilation error on gcc < 4.4 as below:

     CC builtin-trace.o
     CC builtin-probe.o
cc1: warnings being treated as errors
builtin-probe.c: In function 'parse_probepoint':
builtin-probe.c:109: error: implicit declaration of function 'strndup'
builtin-probe.c:109: error: incompatible implicit declaration of built-in function 'strndup'

Since I forgot to add _GNU_SOURCE...


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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