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

From: Brendan Higgins <brendanhiggins@google.com>
To: Kees Cook <keescook@chromium.org>
Cc: 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, monstr@monstr.eu,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	paulus@samba.org, chris@zankel.net, jcmvbkbc@gmail.com,
	Greg KH <gregkh@linuxfoundation.org>,
	Stephen Boyd <sboyd@kernel.org>,
	Logan Gunthorpe <logang@deltatee.com>,
	Luis Chamberlain <mcgrof@kernel.org>,
	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: Fri, 26 Jun 2020 14:22:11 -0700	[thread overview]
Message-ID: <CAFd5g47vu5vmrXnS0sLu+hdC2HmYz7GY82sE8rhcHfNkuC1NRw@mail.gmail.com> (raw)
In-Reply-To: <202006261416.F4EAAE47E3@keescook>

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.

Alright, will fix.