linux-kernel - Re: [PATCH tracing/kprobes v2 4/5] perf: Add perf probe subcommand for kprobe-event setup helper

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Date:	Mon, 05 Oct 2009 20:57:28 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	rostedt@...dmis.org
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	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 v2 4/5] perf: Add perf probe subcommand
 for kprobe-event setup helper

Steven Rostedt wrote:
> On Fri, 2009-10-02 at 17:49 -0400, Masami Hiramatsu wrote:
>> diff --git a/tools/perf/Makefile b/tools/perf/Makefile
>> index b5f1953..6dabcf1 100644
>> --- a/tools/perf/Makefile
>> +++ b/tools/perf/Makefile
>> @@ -419,6 +419,16 @@ ifneq ($(shell sh -c "(echo '\#include <libelf.h>'; echo 'int main(void) { Elf *
>>  	msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel);
>>  endif
>>  
>> +ifneq ($(shell sh -c "(echo '\#include <libdwarf/dwarf.h>'; echo '\#include <libdwarf/libdwarf.h>'; echo 'int main(void) { Dwarf_Debug dbg; Dwarf_Error err; dwarf_init(0, DW_DLC_READ, 0, 0, &dbg, &err); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -ldwarf -lelf -o /dev/null $(ALL_LDFLAGS) > /dev/null 2>&1 && echo y"), y)
>> +	msg := $(warning No libdwarf.h found, disables probe subcommand. Please install libdwarf-dev/libdwarf-devel);
> 
> Wow! And I thought my macros were ugly ;-)

:-)
Maybe, would I better make a separate c file to check this?
Like "autoconf-checkdwarf.c".

>> +
>> +	/* Copy arguments */
>> +	pp->nr_args = argc - 2;
>> +	if (pp->nr_args > 0) {
>> +		pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
> 
> Hmm, you don't check for failed malloc here?

Oops...

>> +static int synthesize_probepoint(struct probe_point *pp)
>> +{
>> +	char *buf;
>> +	int i, len, ret;
>> +	pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
> 
> Again no check for failed calloc?

Oops again, I'll check it...


>> diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
>> index e11d8d2..ad5f0f4 100644
>> --- a/tools/perf/builtin.h
>> +++ b/tools/perf/builtin.h
> 
> The rest looks fine (for what I can tell, it is all dwarf magic to
> me ;-)

:-)

Thank you!

-- 
Masami Hiramatsu

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

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

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