[PATCH] perf: unwind: Fix symfs with libdw

* [PATCH] perf: unwind: Fix symfs with libdw
@ 2022-11-25 11:27 Vincent Whitchurch
  0 siblings, 0 replies; only message in thread
From: Vincent Whitchurch @ 2022-11-25 11:27 UTC (permalink / raw)
  To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo
  Cc: kernel, Vincent Whitchurch, Mark Rutland, Alexander Shishkin,
	Jiri Olsa, Namhyung Kim, linux-perf-users, linux-kernel

Pass the full path including the symfs (if any) to libdw.  Without this
unwinding fails with errors like this when a symfs is used:

  unwind: failed with 'No such file or directory'"

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
---
 tools/perf/util/unwind-libdw.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index 94aa40f6e348..1915c9769dbe 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -66,9 +66,13 @@ static int __report_module(struct addr_location *al, u64 ip,
 			mod = 0;
 	}
 
-	if (!mod)
-		mod = dwfl_report_elf(ui->dwfl, dso->short_name, dso->long_name, -1,
+	if (!mod) {
+		char filename[PATH_MAX];
+
+		__symbol__join_symfs(filename, sizeof(filename), dso->long_name);
+		mod = dwfl_report_elf(ui->dwfl, dso->short_name, filename, -1,
 				      al->map->start - al->map->pgoff, false);
+	}
 	if (!mod) {
 		char filename[PATH_MAX];
 
-- 
2.34.1


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