linux-kernel - [PATCH 2/4] perf report: Load PE files from debug cache only

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Date:   Wed, 10 Feb 2021 14:17:38 -0500
From:   Nicholas Fraser <nfraser@...eweavers.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        "Frank Ch. Eigler" <fche@...hat.com>,
        Song Liu <songliubraving@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kim Phillips <kim.phillips@....com>,
        Tommi Rantala <tommi.t.rantala@...ia.com>,
        Remi Bernon <rbernon@...eweavers.com>,
        linux-kernel@...r.kernel.org
Cc:     Ulrich Czekalla <uczekalla@...eweavers.com>,
        Huw Davies <huw@...eweavers.com>
Subject: [PATCH 2/4] perf report: Load PE files from debug cache only

dso__load_bfd_symbols() attempts to load a DSO at its original path,
then closes it and loads the file in the debug cache. This is incorrect.
It should ignore the original file and work with only the debug cache.
The original file may have changed or may not even exist, for example if
the debug cache has been transferred to another machine via "perf
archive".

This fix makes it only load the file in the debug cache.

Signed-off-by: Nicholas Fraser <nfraser@...eweavers.com>
---
 tools/perf/util/symbol.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 64a039cbba1b..aa9ae875b995 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1569,7 +1569,7 @@ int dso__load_bfd_symbols(struct dso *dso, const char *debugfile)
 	u_int i;
 	u64 start, len;
 
-	abfd = bfd_openr(dso->long_name, NULL);
+	abfd = bfd_openr(debugfile, NULL);
 	if (!abfd)
 		return -1;
 
@@ -1586,12 +1586,6 @@ int dso__load_bfd_symbols(struct dso *dso, const char *debugfile)
 	if (section)
 		dso->text_offset = section->vma - section->filepos;
 
-	bfd_close(abfd);
-
-	abfd = bfd_openr(debugfile, NULL);
-	if (!abfd)
-		return -1;
-
 	if (!bfd_check_format(abfd, bfd_object)) {
 		pr_debug2("%s: cannot read %s bfd file.\n", __func__,
 			  debugfile);
-- 
2.30.0