linux-kernel - [PATCH v4 3/5] perf: disasm: use build_id

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Date: Tue, 25 Jun 2024 11:37:38 +0800
From: Changbin Du <changbin.du@...wei.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim
	<namhyung@...nel.org>, Nathan Chancellor <nathan@...nel.org>
CC: Mark Rutland <mark.rutland@....com>, Alexander Shishkin
	<alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, Ian
 Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, "Liang,
 Kan" <kan.liang@...ux.intel.com>, Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
	<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<llvm@...ts.linux.dev>, Changbin Du <changbin.du@...wei.com>
Subject: [PATCH v4 3/5] perf: disasm: use build_id_path if fallback failed

If we can not fallback for special dso (vmlinx and vdso), use the
build_id_path found previously.

Signed-off-by: Changbin Du <changbin.du@...wei.com>
---
 tools/perf/util/disasm.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
index c4ab98c0eaa1..f4e94ff37e50 100644
--- a/tools/perf/util/disasm.c
+++ b/tools/perf/util/disasm.c
@@ -1176,15 +1176,21 @@ static int dso__disassemble_filename(struct dso *dso, char *filename, size_t fil
 		return fallback_filename(dso, filename, filename_size);
 
 	if (dso__is_kcore(dso) || dso__is_vdso(dso))
-		return fallback_filename(dso, filename, filename_size);
+		goto fallback;
 
-	if (read_buildid_linkname(filename, linkname, sizeof(linkname) - 1) ||
-	    strstr(linkname, DSO__NAME_KALLSYMS) || strstr(linkname, DSO__NAME_VDSO)) {
-		return fallback_filename(dso, filename, filename_size);
+	if (!read_buildid_linkname(filename, linkname, sizeof(linkname) - 1) &&
+	    (!strstr(linkname, DSO__NAME_KALLSYMS) && !strstr(linkname, DSO__NAME_VDSO))) {
+		/* It's not kallsysms or vdso, use build_id path found above */
+		goto out;
 	}
 
-	if (dso__binary_type(dso) == DSO_BINARY_TYPE__NOT_FOUND)
-		dso__set_binary_type(dso, DSO_BINARY_TYPE__BUILD_ID_CACHE);
+fallback:
+	if (fallback_filename(dso, filename, filename_size)) {
+		/* if fallback failed, use build_id path found above */
+out:
+		if (dso__binary_type(dso) == DSO_BINARY_TYPE__NOT_FOUND)
+			dso__set_binary_type(dso, DSO_BINARY_TYPE__BUILD_ID_CACHE);
+	}
 	return 0;
 }
 
-- 
2.34.1