linux-kernel - Re: [PATCH 2/3] selftests: add membarrier syscall test

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Date:	Thu, 03 Sep 2015 19:33:59 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-api <linux-api@...r.kernel.org>,
	Pranith Kumar <bobby.prani@...il.com>
Subject: Re: [PATCH 2/3] selftests: add membarrier syscall test

On Tue, 2015-09-01 at 11:32 -0700, Andy Lutomirski wrote:
> On Tue, Sep 1, 2015 at 10:11 AM, Mathieu Desnoyers
> <mathieu.desnoyers@...icios.com> wrote:
> > Just to make sure I understand: should we expect that
> > everyone will issue "make headers_install" on their system
> > before doing a make kselftest ?
> >
> > I see that a few selftests (e.g. memfd) are adding the
> > source tree include paths to the compiler include paths,
> > which I guess is to ensure that the kselftest will
> > work even if the system headers are not up to date.
> 
> It would be really nice if there were a clean way for selftests to
> include the kernel headers.  

What's wrong with make headers_install?

Or do you mean when writing the tests? That we could fix by adding the
../../../../usr/include path to CFLAGS in lib.mk. And fixing all the tests that
overwrite CFLAGS to append to CFLAGS.

> Perhaps make should build the exportable headers somewhere as a dependency of
> kselftests.

Yeah the top-level kselftest target could do that I think.

Folks who don't want the headers installed can just run the selftests Makefile
directly.

Does this work for you?

diff --git a/Makefile b/Makefile
index c361593..c8841d3 100644
--- a/Makefile
+++ b/Makefile
@@ -1080,7 +1080,7 @@ headers_check: headers_install
 # Kernel selftest
 
 PHONY += kselftest
-kselftest:
+kselftest: headers_install
        $(Q)$(MAKE) -C tools/testing/selftests run_tests
 
 # ---------------------------------------------------------------------------

cheers


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