Patch "perf tools: Decompress kernel module when reading DSO data" has been added to the 4.9-stable tree

Patch "perf tools: Decompress kernel module when reading DSO data" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    perf tools: Decompress kernel module when reading DSO data

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     perf-tools-decompress-kernel-module-when-reading-dso-data.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 17:09:24 CEST 2018
From: Namhyung Kim <namhyung@kernel.org>
Date: Thu, 8 Jun 2017 16:31:05 +0900
Subject: perf tools: Decompress kernel module when reading DSO data

From: Namhyung Kim <namhyung@kernel.org>


[ Upstream commit 1d6b3c9ba756a5134fd7ad1959acac776d17404b ]

Currently perf decompresses kernel modules when loading the symbol table
but it missed to do it when reading raw data.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
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/20170608073109.30699-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 tools/perf/util/dso.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -366,7 +366,23 @@ static int __open_dso(struct dso *dso, s
 	if (!is_regular_file(name))
 		return -EINVAL;
 
+	if (dso__needs_decompress(dso)) {
+		char newpath[KMOD_DECOMP_LEN];
+		size_t len = sizeof(newpath);
+
+		if (dso__decompress_kmodule_path(dso, name, newpath, len) < 0) {
+			free(name);
+			return -dso->load_errno;
+		}
+
+		strcpy(name, newpath);
+	}
+
 	fd = do_open(name);
+
+	if (dso__needs_decompress(dso))
+		unlink(name);
+
 	free(name);
 	return fd;
 }


Patches currently in stable-queue which might be from namhyung@kernel.org are

queue-4.9/perf-report-fix-off-by-one-for-non-activation-frames.patch
queue-4.9/perf-trace-add-mmap-alias-for-s390.patch
queue-4.9/perf-report-ensure-the-perf-dso-mapping-matches-what-libdw-sees.patch
queue-4.9/perf-tools-fix-copyfile_offset-update-of-output-offset.patch
queue-4.9/perf-tools-decompress-kernel-module-when-reading-dso-data.patch
queue-4.9/perf-tests-decompress-kernel-module-before-objdump.patch
queue-4.9/perf-header-set-proper-module-name-when-build-id-event-found.patch