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From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Jiri Olsa <jolsa@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
	kernel-team@lge.com, David Ahern <dsahern@gmail.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Wang Nan <wangnan0@huawei.com>,
	Taeung Song <treeze.taeung@gmail.com>
Subject: [PATCH v4 1/9] perf annotate: Fix symbolic link of build-id cache
Date: Thu,  8 Jun 2017 16:31:01 +0900
Message-ID: <20170608073109.30699-2-namhyung@kernel.org> (raw)
In-Reply-To: <20170608073109.30699-1-namhyung@kernel.org>

The commit 6ebd2547dd24 ("perf annotate: Fix a bug following symbolic
link of a build-id file") changed to use dirname to follow the symlink.
But it only considers new-style build-id cache names so old names fail
on readlink() and force to use system path which might not available.

Cc: Taeung Song <treeze.taeung@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/annotate.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 1367d7e35242..df4486c3a2fa 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1321,6 +1321,7 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
 	char linkname[PATH_MAX];
 	char *build_id_filename;
 	char *build_id_path = NULL;
+	char *pos;
 
 	if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
 	    !dso__is_kcore(dso))
@@ -1340,7 +1341,14 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
 	if (!build_id_path)
 		return -1;
 
-	dirname(build_id_path);
+	/*
+	 * old style build-id cache has name of XX/XXXXXXX.. while
+	 * new style has XX/XXXXXXX../{elf,kallsyms,vdso}.
+	 * extract the build-id part of dirname in the new style only.
+	 */
+	pos = strrchr(build_id_path, '/');
+	if (pos && strlen(pos) < SBUILD_ID_SIZE - 2)
+		dirname(build_id_path);
 
 	if (dso__is_kcore(dso) ||
 	    readlink(build_id_path, linkname, sizeof(linkname)) < 0 ||
-- 
2.13.1

  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-08  7:31 [PATCHSET 0/9] perf tools: Fix for compressed kernel modules (v4) Namhyung Kim
2017-06-08  7:31 ` Namhyung Kim [this message]
2017-06-08 22:49   ` [tip:perf/urgent] perf annotate: Fix symbolic link of build-id cache tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 2/9] perf tools: Fix a memory leak in __open_dso() Namhyung Kim
2017-06-08 22:50   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 3/9] perf tools: Introduce dso__decompress_kmodule_{fd,path} Namhyung Kim
2017-06-08 22:50   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 4/9] perf annotate: Use dso__decompress_kmodule_path() Namhyung Kim
2017-06-08 22:51   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 5/9] perf tools: Decompress kernel module when reading DSO data Namhyung Kim
2017-06-08 22:51   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 6/9] perf tools: Consolidate error path in __open_dso() Namhyung Kim
2017-06-08 22:52   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 7/9] perf test: Decompress kernel module before objdump Namhyung Kim
2017-06-08  7:34   ` Adrian Hunter
2017-06-08 22:52   ` [tip:perf/urgent] perf tests: " tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 8/9] perf symbols: Keep DSO->symtab_type after decompress Namhyung Kim
2017-06-08 22:53   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2017-06-08  7:31 ` [PATCH v4 9/9] perf symbols: Kill dso__build_id_is_kmod() Namhyung Kim
2017-06-08 22:53   ` [tip:perf/urgent] " tip-bot for Namhyung Kim
2017-06-08 12:10 ` [PATCHSET 0/9] perf tools: Fix for compressed kernel modules (v4) Jiri Olsa

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