linux-kernel - [tools/perf] perf test LLVM failure on 4.9

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Date:   Tue, 23 Jan 2018 18:07:25 +0530
From:   Pintu Kumar <pintu.ping@...il.com>
To:     linux-kernel@...r.kernel.org, kernelnewbies@...nelnewbies.org,
        Pintu Kumar <pintu.ping@...il.com>,
        quentin.monnet@...ronome.com, daniel@...earbox.net,
        davem@...emloft.net, wangnan0@...wei.com, acme@...hat.com,
        alexander.shishkin@...ux.intel.com, mingo@...hat.com
Subject: [tools/perf] perf test LLVM failure on 4.9

Hi All,

I am verifying all perf tests on Ubuntu-16 x86-64 platform using the
kernel version 4.9.20.
I have installed several others packages including: clang, llvm

But, when I run 'perf test' I get some FAILURE.
Specially, 'perf test LLVM' is failing.

Please check the below error logs:

----------------------------------------------------
# perf test LLVM
35: Test LLVM searching and compiling                        :
35.1: Basic BPF llvm compiling test                          : FAILED!
35.2: Test kbuild searching                                  : Skip
35.3: Compile source for BPF prologue generation test        : Skip
35.4: Compile source for BPF relocation test                 : Skip
----------------------------------------------------

When I run with -v I get this:

-----------------------------------------------------
# perf test -v LLVM
35: Test LLVM searching and compiling                        :
35.1: Basic BPF llvm compiling test                          :
--- start ---
test child forked, pid 3304
Unablt to get kernel version from uname '4.9-xxxx-amd-x86-64'
WARNING:        unable to get correct kernel building directory.
Hint:   Set correct kbuild directory using 'kbuild-dir' option in [llvm]
        section of ~/.perfconfig or set it to "" to suppress kbuild
        detection.

Unablt to get kernel version from uname '4.9-xxxx-amd-x86-64'


int _version SEC("version") = LINUX_VERSION_CODE;
' | $CLANG_EXEC -D__KERNEL__ -D__NR_CPUS__=$NR_CPUS
-DLINUX_VERSION_CODE=$LINUX_VERSION_CODE $CLANG_OPTIONS
$KERNEL_INC_OPTIONS -Wno-unused-value -Wno-pointer-sign
-working-directory $WORKING_DIR -c "$CLANG_SOURCE" -target bpf -O2 -o
-
libbpf: 2129190-4a0 doesn't provide kernel version
Failed to parse test case 'Basic BPF llvm compiling test'
test child finished with -1
---- end ----
Test LLVM searching and compiling subtest 0: FAILED!
-----------------------------------------------------


Basic BPF LLVM compiling test is failing.
It reports that bpf could not able to read the kernel version from uname.
Is it because of this that 'perf test LLVM' is failing ?

My uname says:
4.9-xxxx-amd-x86-64

My kernel version is: 4.9.20 (from Makefile)

So, I dont think there is any problem with kernel version.

If any body have come across this problem please let me know how to
resolve this issue.



Thank You!

Regards,
Pintu