Date:   Thu, 9 May 2019 16:40:56 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        shuah <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [GIT PULL] Kselftest update for Linux 5.2-rc1

On 5/9/19 4:20 PM, Alexei Starovoitov wrote:
> On Mon, May 06, 2019 at 10:56:56AM -0600, Shuah Khan wrote:
>> Hi Linus,
>>
>> Please pull the following Kselftest update for Linux 5.2-rc1
>>
>> This Kselftest update for Linux 5.2-rc1 consists of
>>
>> - fixes to seccomp test, and kselftest framework
>> - cleanups to remove duplicate header defines
>> - fixes to efivarfs "make clean" target
>> - cgroup cleanup path
>> - Moving the IMA kexec_load selftest to selftests/kexec work from
>>    Mimi Johar and Petr Vorel
>> - A framework to kselftest for writing kernel test modules addition
>>    from Tobin C. Harding
>>
>> diff is attached.
>>
>> thanks,
>> -- Shuah
>>
>>
>> ----------------------------------------------------------------
>> The following changes since commit 15ade5d2e7775667cf191cf2f94327a4889f8b9d:
>>
>>    Linux 5.1-rc4 (2019-04-07 14:09:59 -1000)
>>
>> are available in the Git repository at:
>>
>>    git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
>> tags/linux-kselftest-5.2-rc1
>>
>> for you to fetch changes up to d917fb876f6eaeeea8a2b620d2a266ce26372f4d:
>>
>>    selftests: build and run gpio when output directory is the src dir
>> (2019-04-22 17:02:26 -0600)
>>
>> ----------------------------------------------------------------
>> linux-kselftest-5.2-rc1
>>
>> This Kselftest update for Linux 5.2-rc1 consists of
>>
>> - fixes to seccomp test, and kselftest framework
>> - cleanups to remove duplicate header defines
>> - fixes to efivarfs "make clean" target
>> - cgroup cleanup path
>> - Moving the IMA kexec_load selftest to selftests/kexec work from
>>    Mimi Johar and Petr Vorel
>> - A framework to kselftest for writing kernel test modules addition
>>    from Tobin C. Harding
>>
>> ----------------------------------------------------------------
>> Kees Cook (3):
>>        selftests/seccomp: Handle namespace failures gracefully
>>        selftests/harness: Add 30 second timeout per test
>>        selftests/ipc: Fix msgque compiler warnings
>>
>> Mathieu Desnoyers (1):
>>        rseq/selftests: Adapt number of threads to the number of detected cpus
>>
>> Mimi Zohar (9):
>>        selftests/kexec: move the IMA kexec_load selftest to selftests/kexec
>>        selftests/kexec: cleanup the kexec selftest
>>        selftests/kexec: define a set of common functions
>>        selftests/kexec: define common logging functions
>>        selftests/kexec: define "require_root_privileges"
>>        selftests/kexec: kexec_file_load syscall test
>>        selftests/kexec: check kexec_load and kexec_file_load are enabled
>>        selftests/kexec: make kexec_load test independent of IMA being enabled
>>        selftests/kexec: update get_secureboot_mode
>>
>> Petr Vorel (1):
>>        selftests/kexec: Add missing '=y' to config options
>>
>> Po-Hsu Lin (1):
>>        selftests/efivarfs: clean up test files from test_create*()
>>
>> Roman Gushchin (1):
>>        selftests: cgroup: fix cleanup path in test_memcg_subtree_control()
>>
>> Sabyasachi Gupta (4):
>>        selftest/x86/mpx-dig.c: Remove duplicate header
>>        selftest/timers: Remove duplicate header
>>        selftest/rseq: Remove duplicate header
>>        selftest/gpio: Remove duplicate header
>>
>> Shuah Khan (2):
>>        selftests: fix headers_install circular dependency
> 
> Shuah,
> 
> the commit 8ce72dc32578 ("selftests: fix headers_install circular dependency")
> broke our build/test workflow, since it added:
>    ifneq ($(KBUILD_OUTPUT),)
>            OUTPUT := $(KBUILD_OUTPUT)
>    else
> 
> which means that all of selftests/bpf artifacts are now going into
> main build directory cluttering it with all sorts of .o, generated files
> and executables.
> The end result is humans and scripts can no longer find tests.
> 
> For now I hacked it as:
> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
> index 5979fdc4f36c..caecec7aebde 100644
> --- a/tools/testing/selftests/lib.mk
> +++ b/tools/testing/selftests/lib.mk
> @@ -6,12 +6,8 @@ ifeq (0,$(MAKELEVEL))
>       ifneq ($(O),)
>          OUTPUT := $(O)
>       else
> -       ifneq ($(KBUILD_OUTPUT),)
> -               OUTPUT := $(KBUILD_OUTPUT)
> -       else
> -               OUTPUT := $(shell pwd)
> -               DEFAULT_INSTALL_HDR_PATH := 1
> -       endif
> +       OUTPUT := $(shell pwd)
> +       DEFAULT_INSTALL_HDR_PATH := 1
>       endif
>   endif
> 
> bpf developers are doing "cd tools/testing/selftests/bpf; make; ./test_verifier; ..."
> while KBUILD_OUTPUT is also set.
Sorry about that. I tested several use-cases, and missed this one. :(
This patch was in next for a while before I sent the pull request.

> I don't quite get this 'circular dependency' issue that your commit suppose to address
> but please fix it differently, so bpf developer's workflow is restored and buildbots work again.
> People and scripts depend on it.
> It's even described in Documentation/bpf/bpf_devel_QA.rst
> 

You won't see the circular dependency with your use-case. I will try
to get the fix in.

thanks,
-- Shuah

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