linux-kernel - [PATCH 4/5] perf tools: Use machine->root

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Message-ID: <20251202081645.931527-5-namhyung@kernel.org>
Date: Tue,  2 Dec 2025 00:16:44 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	James Clark <james.clark@...aro.org>
Cc: Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org
Subject: [PATCH 4/5] perf tools: Use machine->root_dir to find /proc/kallsyms

This is for test functions to find the kallsyms correctly.  It can find
the machine from the kernel maps and use its root_dir.  This is helpful
to setup fake /proc directory for testing.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/symbol.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index b533fbf17a8b19a3..e90ecfd286043aa4 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2002,6 +2002,7 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
 	char sbuild_id[SBUILD_ID_SIZE];
 	bool is_host = false;
 	char path[PATH_MAX];
+	struct kmap *kmap = map__kmap(map);
 
 	if (!dso__has_build_id(dso)) {
 		/*
@@ -2038,8 +2039,13 @@ static char *dso__find_kallsyms(struct dso *dso, struct map *map)
 		return strdup(path);
 
 	/* Use current /proc/kallsyms if possible */
-	if (is_host) {
 proc_kallsyms:
+	if (kmap && kmap->kmaps) {
+		struct machine *machine = maps__machine(kmap->kmaps);
+
+		scnprintf(path, sizeof(path), "%s/proc/kallsyms", machine->root_dir);
+		return strdup(path);
+	} else if (is_host) {
 		return strdup("/proc/kallsyms");
 	}
 
-- 
2.52.0.158.g65b55ccf14-goog