linux-kernel - [tip:perf/core] perf symbols: Ignore ABS symbols when loading data maps

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Date:	Thu, 24 Jan 2013 10:44:57 -0800
From:	tip-bot for Namhyung Kim <namhyung.kim@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, eranian@...gle.com,
	hpa@...or.com, mingo@...nel.org, peterz@...radead.org,
	namhyung.kim@....com, namhyung@...nel.org, jolsa@...hat.com,
	ak@...ux.intel.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/core] perf symbols:
  Ignore ABS symbols when loading data maps

Commit-ID:  3843b05d6ef20acbd4b0043e4ab7536602eb10ae
Gitweb:     http://git.kernel.org/tip/3843b05d6ef20acbd4b0043e4ab7536602eb10ae
Author:     Namhyung Kim <namhyung.kim@....com>
AuthorDate: Wed, 21 Nov 2012 13:49:44 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Sun, 9 Dec 2012 08:46:05 -0300

perf symbols: Ignore ABS symbols when loading data maps

When loading symbols in a data mapping, ABS symbols (which has a value
of SHN_ABS in its st_shndx) failed at elf_getscn().  And it marks the
loading as a failure so already loaded symbols cannot be fixed up.

I'm not sure what should be done. Just ignore them for now. :)

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1353502185-26521-19-git-send-email-eranian@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/symbol-elf.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index db0cc92..f63557b 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -718,6 +718,17 @@ int dso__load_sym(struct dso *dso, struct map *map,
 					sym.st_value);
 			used_opd = true;
 		}
+		/*
+		 * When loading symbols in a data mapping, ABS symbols (which
+		 * has a value of SHN_ABS in its st_shndx) failed at
+		 * elf_getscn().  And it marks the loading as a failure so
+		 * already loaded symbols cannot be fixed up.
+		 *
+		 * I'm not sure what should be done. Just ignore them for now.
+		 * - Namhyung Kim
+		 */
+		if (sym.st_shndx == SHN_ABS)
+			continue;
 
 		sec = elf_getscn(runtime_ss->elf, sym.st_shndx);
 		if (!sec)
--
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