[PATCH 07/21] perf symbols: debuglink should take symfs option into account

From: Arnaldo Carvalho de Melo
Date: Wed Feb 11 2015 - 16:09:36 EST

From: Victor Kamensky <victor.kamensky@xxxxxxxxxx>

Currently code that tries to read corresponding debug symbol file from
.gnu_debuglink section (DSO_BINARY_TYPE__DEBUGLINK) does not take in
account symfs option, so filename__read_debuglink function cannot open
ELF file, if symfs option is used.

Fix is to add proper handling of symfs as it is done in other places:
use __symbol__join_symfs function to get real file name of target ELF

Signed-off-by: Victor Kamensky <victor.kamensky@xxxxxxxxxx>
Tested-by: David Ahern <dsahern@xxxxxxxxx>
Acked-by: David Ahern <dsahern@xxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxxxxxxxxxxxx>
Cc: Dave Martin <Dave.Martin@xxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Waiman Long <Waiman.Long@xxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1422340442-4673-3-git-send-email-victor.kamensky@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/util/dso.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index a8b3f18db1a5..814554d1b857 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -45,13 +45,13 @@ int dso__read_binary_type_filename(const struct dso *dso,
char *debuglink;

- strncpy(filename, dso->long_name, size);
- debuglink = filename + dso->long_name_len;
+ len = __symbol__join_symfs(filename, size, dso->long_name);
+ debuglink = filename + len;
while (debuglink != filename && *debuglink != '/')
if (*debuglink == '/')
- ret = filename__read_debuglink(dso->long_name, debuglink,
+ ret = filename__read_debuglink(filename, debuglink,
size - (debuglink - filename));

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