linux-kernel - [PATCH -tip] perf probe: Don't compile CFI related code if elfutils is old

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Date:	Mon, 10 May 2010 13:12:07 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Cc:	Robert Richter <robert.richter@....com>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH -tip] perf probe: Don't compile CFI related code if elfutils
	is old

Check elfutils version, and if it is old don't compile
CFI analysis code. This allows to compile perf with
old elfutils.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Reported-by: Robert Richter <robert.richter@....com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Ingo Molnar <mingo@...e.hu>
---

 tools/perf/util/probe-finder.c |    4 ++++
 tools/perf/util/probe-finder.h |    3 +++
 2 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 562b144..93583eb 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -668,6 +668,7 @@ static int convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
 	ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
 	if (ret <= 0 || nops == 0) {
 		pf->fb_ops = NULL;
+#if _ELFUTILS_PREREQ(0, 142)
 	} else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
 		   pf->cfi != NULL) {
 		Dwarf_Frame *frame;
@@ -677,6 +678,7 @@ static int convert_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
 				   (uintmax_t)pf->addr);
 			return -ENOENT;
 		}
+#endif
 	}
 
 	/* Find each argument */
@@ -956,8 +958,10 @@ int find_kprobe_trace_events(int fd, struct perf_probe_event *pev,
 		return -EBADF;
 	}
 
+#if _ELFUTILS_PREREQ(0, 142)
 	/* Get the call frame information from this dwarf */
 	pf.cfi = dwarf_getcfi(dbg);
+#endif
 
 	off = 0;
 	line_list__init(&pf.lcache);
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index 66f1980..e1f61dc 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -29,6 +29,7 @@ extern int find_line_range(int fd, struct line_range *lr);
 
 #include <dwarf.h>
 #include <libdw.h>
+#include <version.h>
 
 struct probe_finder {
 	struct perf_probe_event	*pev;		/* Target probe event */
@@ -44,7 +45,9 @@ struct probe_finder {
 	struct list_head	lcache;		/* Line cache for lazy match */
 
 	/* For variable searching */
+#if _ELFUTILS_PREREQ(0, 142)
 	Dwarf_CFI		*cfi;		/* Call Frame Information */
+#endif
 	Dwarf_Op		*fb_ops;	/* Frame base attribute */
 	struct perf_probe_arg	*pvar;		/* Current target variable */
 	struct kprobe_trace_arg	*tvar;		/* Current result variable */


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