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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: [BUGFIX PATCH 2/6] perf/probe: Fix to probe a function which has no entry pc
Date: Fri, 25 Oct 2019 17:46:34 +0900
Message-ID: <157199319438.8075.4695576954550638618.stgit@devnote2> (raw)
In-Reply-To: <157199317547.8075.1010940983970397945.stgit@devnote2>

Fix perf probe to probe a function which has no entry pc or
low pc but only has ranges attribute.

probe_point_search_cb() uses dwarf_entrypc() to get the
probe address, but that doesn't work for the function DIE
which has only ranges attribute. Use die_entrypc() instead.

Without this fix,
  # tools/perf/perf probe -k ../build-x86_64/vmlinux -D clear_tasks_mm_cpumask:0
  Probe point 'clear_tasks_mm_cpumask' not found.
    Error: Failed to add events.

With this,
  # tools/perf/perf probe -k ../build-x86_64/vmlinux -D clear_tasks_mm_cpumask:0
  p:probe/clear_tasks_mm_cpumask clear_tasks_mm_cpumask+0

Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Fixes: e1ecbbc3fa83 ("perf probe: Fix to handle optimized not-inlined functions")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/perf/util/probe-finder.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 2b6513e5725c..71633f55f045 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -982,7 +982,7 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
 		param->retval = find_probe_point_by_line(pf);
 	} else if (die_is_func_instance(sp_die)) {
 		/* Instances always have the entry address */
-		dwarf_entrypc(sp_die, &pf->addr);
+		die_entrypc(sp_die, &pf->addr);
 		/* But in some case the entry address is 0 */
 		if (pf->addr == 0) {
 			pr_debug("%s has no entry PC. Skipped\n",


  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-25  8:46 [BUGFIX PATCH 0/6] perf/probe: Additional fixes for range only functions Masami Hiramatsu
2019-10-25  8:46 ` [BUGFIX PATCH 1/6] perf/probe: Fix wrong address verification Masami Hiramatsu
2019-10-25 12:14   ` Arnaldo Carvalho de Melo
2019-10-25 12:36     ` Masami Hiramatsu
2019-10-25 14:28       ` Arnaldo Carvalho de Melo
2019-11-12 11:18   ` [tip: perf/core] perf probe: " tip-bot2 for Masami Hiramatsu
2019-10-25  8:46 ` Masami Hiramatsu [this message]
2019-11-12 11:18   ` [tip: perf/core] perf probe: Fix to probe a function which has no entry pc tip-bot2 for Masami Hiramatsu
2019-10-25  8:46 ` [BUGFIX PATCH 3/6] perf/probe: Fix to probe an inline " Masami Hiramatsu
2019-10-25 14:35   ` Arnaldo Carvalho de Melo
2019-10-25 14:39     ` Arnaldo Carvalho de Melo
2019-10-26  8:04       ` Masami Hiramatsu
2019-11-12 11:18   ` [tip: perf/core] perf probe: " tip-bot2 for Masami Hiramatsu
2019-10-25  8:46 ` [BUGFIX PATCH 4/6] perf/probe: Fix to list probe event with correct line number Masami Hiramatsu
2019-11-12 11:18   ` [tip: perf/core] perf probe: " tip-bot2 for Masami Hiramatsu
2019-10-25  8:47 ` [BUGFIX PATCH 5/6] perf/probe: Fix to show inlined function callsite without entry_pc Masami Hiramatsu
2019-11-12 11:18   ` [tip: perf/core] perf probe: " tip-bot2 for Masami Hiramatsu
2019-10-25  8:47 ` [BUGFIX PATCH 6/6] perf/probe: Fix to show ranges of variables in functions " Masami Hiramatsu
2019-11-12 11:18   ` [tip: perf/core] perf probe: " tip-bot2 for Masami Hiramatsu

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