Re: [PATCH v5 01/12] vmlinux.lds.h: add linker section for KUnit test suites

From: Brendan Higgins <brendanhiggins@google.com>
To: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>, Jeff Dike <jdike@addtoit.com>,
	Richard Weinberger <richard@nod.at>,
	Anton Ivanov <anton.ivanov@cambridgegreys.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Alan Maguire <alan.maguire@oracle.com>,
	Iurii Zaikin <yzaikin@google.com>,
	David Gow <davidgow@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	rppt@linux.ibm.com, Frank Rowand <frowand.list@gmail.com>,
	catalin.marinas@arm.com, will@kernel.org,
	Michal Simek <monstr@monstr.eu>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Chris Zankel <chris@zankel.net>,
	jcmvbkbc@gmail.com, Greg KH <gregkh@linuxfoundation.org>,
	Stephen Boyd <sboyd@kernel.org>,
	Logan Gunthorpe <logang@deltatee.com>,
	linux-um <linux-um@lists.infradead.org>,
	linux-arch@vger.kernel.org,
	"open list:KERNEL SELFTEST FRAMEWORK" 
	<linux-kselftest@vger.kernel.org>,
	KUnit Development <kunit-dev@googlegroups.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linuxppc-dev@lists.ozlabs.org, linux-xtensa@linux-xtensa.org
Subject: Re: [PATCH v5 01/12] vmlinux.lds.h: add linker section for KUnit test suites
Date: Tue, 4 Aug 2020 13:03:35 -0700	[thread overview]
Message-ID: <CAFd5g45vE7CvgEKYNJeLUiyZb=6Ps52nSqQPJ35+EyC7Y3wkdw@mail.gmail.com> (raw)
In-Reply-To: <20200708043128.GY4332@42.do-not-panic.com>

On Tue, Jul 7, 2020 at 9:31 PM Luis Chamberlain <mcgrof@kernel.org> wrote:
>
> On Fri, Jun 26, 2020 at 02:22:11PM -0700, Brendan Higgins wrote:
> > On Fri, Jun 26, 2020 at 2:20 PM Kees Cook <keescook@chromium.org> wrote:
> > >
> > > On Fri, Jun 26, 2020 at 02:09:06PM -0700, Brendan Higgins wrote:
> > > > Add a linker section where KUnit can put references to its test suites.
> > > > This patch is the first step in transitioning to dispatching all KUnit
> > > > tests from a centralized executor rather than having each as its own
> > > > separate late_initcall.
> > > >
> > > > Co-developed-by: Iurii Zaikin <yzaikin@google.com>
> > > > Signed-off-by: Iurii Zaikin <yzaikin@google.com>
> > > > Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> > > > Reviewed-by: Stephen Boyd <sboyd@kernel.org>
> > > > ---
> > > >  include/asm-generic/vmlinux.lds.h | 8 ++++++++
> > > >  1 file changed, 8 insertions(+)
> > > >
> > > > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> > > > index db600ef218d7d..4f9b036fc9616 100644
> > > > --- a/include/asm-generic/vmlinux.lds.h
> > > > +++ b/include/asm-generic/vmlinux.lds.h
> > > > @@ -881,6 +881,13 @@
> > > >               KEEP(*(.con_initcall.init))                             \
> > > >               __con_initcall_end = .;
> > > >
> > > > +/* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
> > >
> > > Nit on naming:
> > >
> > > > +#define KUNIT_TEST_SUITES                                            \
> > >
> > > I would call this KUNIT_TABLE to maintain the same names as other things
> > > of this nature.
> > >
> > > > +             . = ALIGN(8);                                           \
> > > > +             __kunit_suites_start = .;                               \
> > > > +             KEEP(*(.kunit_test_suites))                             \
> > > > +             __kunit_suites_end = .;
> > > > +
> > > >  #ifdef CONFIG_BLK_DEV_INITRD
> > > >  #define INIT_RAM_FS                                                  \
> > > >       . = ALIGN(4);                                                   \
> > > > @@ -1056,6 +1063,7 @@
> > > >               INIT_CALLS                                              \
> > > >               CON_INITCALL                                            \
> > > >               INIT_RAM_FS                                             \
> > > > +             KUNIT_TEST_SUITES                                       \
> > > >       }
> > >
> > > Nack: this must be in INIT_DATA, not in INIT_DATA_SECTION. Not all
> > > architectures use the INIT_DATA_SECTION macro (e.g. arm64), but everything
> > > uses INIT_DATA.
> >
> > Oh, maybe that would eliminate the need for the other linkerscript
> > patches? That would be nice.

Sorry for the delayed response. I got pulled into some other things.

> Curious, did changing it as Kees suggest fix it for m68k?

It did! There are still some architectures I cannot test due to a lack
of GCC or QEMU support, but it seems to work on everything else now.