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, 5 Oct 2009 22:43:32 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	rostedt@...dmis.org, 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>,
	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

Em Mon, Oct 05, 2009 at 08:57:28PM -0400, Masami Hiramatsu escreveu:
> 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".

I saw that coming, I'd say leave it as is... :)
 
> >> +
> >> +	/* 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...

Also no need for cast
 

- Arnaldo
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