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From:   Sasha Levin <Alexander.Levin@microsoft.com>
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        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Namhyung Kim <namhyung@kernel.org>,
        David Ahern <dsahern@gmail.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Wang Nan <wangnan0@huawei.com>,
        "kernel-team@lge.com" <kernel-team@lge.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 140/167] perf tests: Decompress kernel module
 before objdump
Thread-Topic: [PATCH AUTOSEL for 4.4 140/167] perf tests: Decompress kernel
 module before objdump
Thread-Index: AQHTv5x+0ElvJ8Bke02EnUy4VtJaiA==
Date:   Mon, 19 Mar 2018 16:08:18 +0000
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From: Namhyung Kim <namhyung@kernel.org>

[ Upstream commit 94df1040b1e6aacd8dec0ba3c61d7e77cd695f26 ]

If a kernel modules is compressed, it should be decompressed before
running objdump to parse binary data correctly.  This fixes a failure of
object code reading test for me.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20170608073109.30699-8-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 tools/perf/tests/code-reading.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-readin=
g.c
index a767a6400c5c..6ea4fcfaab36 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -182,6 +182,8 @@ static int read_object_code(u64 addr, size_t len, u8 cp=
umode,
 	unsigned char buf2[BUFSZ];
 	size_t ret_len;
 	u64 objdump_addr;
+	const char *objdump_name;
+	char decomp_name[KMOD_DECOMP_LEN];
 	int ret;
=20
 	pr_debug("Reading object code for memory address: %#"PRIx64"\n", addr);
@@ -242,9 +244,25 @@ static int read_object_code(u64 addr, size_t len, u8 c=
pumode,
 		state->done[state->done_cnt++] =3D al.map->start;
 	}
=20
+	objdump_name =3D al.map->dso->long_name;
+	if (dso__needs_decompress(al.map->dso)) {
+		if (dso__decompress_kmodule_path(al.map->dso, objdump_name,
+						 decomp_name,
+						 sizeof(decomp_name)) < 0) {
+			pr_debug("decompression failed\n");
+			return -1;
+		}
+
+		objdump_name =3D decomp_name;
+	}
+
 	/* Read the object code using objdump */
 	objdump_addr =3D map__rip_2objdump(al.map, al.addr);
-	ret =3D read_via_objdump(al.map->dso->long_name, objdump_addr, buf2, len)=
;
+	ret =3D read_via_objdump(objdump_name, objdump_addr, buf2, len);
+
+	if (dso__needs_decompress(al.map->dso))
+		unlink(objdump_name);
+
 	if (ret > 0) {
 		/*
 		 * The kernel maps are inaccurate - assume objdump is right in
--=20
2.14.1