Re: [PATCH] selftests/landlock: fix broken include of linux/landlock.h

[Mickaël Salaün <mic@xxxxxxxxxxx>]

On 22/08/2022 16:00, Anders Roxell wrote:
> On Sat, 13 Aug 2022 at 14:31, Mickaël Salaün <mic@xxxxxxxxxxx> wrote:
> > On 13/08/2022 12:01, Anders Roxell wrote:
> > > On Wed, 3 Aug 2022 at 22:14, Guillaume Tucker
> > > <guillaume.tucker@xxxxxxxxxxxxx> wrote:
> > > > Revert part of the earlier changes to fix the kselftest build when
> > > > using a sub-directory from the top of the tree as this broke the
> > > > landlock test build as a side-effect when building with "make -C
> > > > tools/testing/selftests/landlock".
> > > >
> > > > Reported-by: Mickaël Salaün <mic@xxxxxxxxxxx>
> > > > Fixes: a917dd94b832 ("selftests/landlock: drop deprecated headers dependency")
> > > > Fixes: f2745dc0ba3d ("selftests: stop using KSFT_KHDR_INSTALL")
> > > > Signed-off-by: Guillaume Tucker <guillaume.tucker@xxxxxxxxxxxxx>
> > >
> > > Building with this patch doesn't work, it gives this output:
> > > make[3]: Entering directory
> > > '/home/anders/src/kernel/next/tools/testing/selftests/landlock'
> > > make[3]: Leaving directory
> > > '/home/anders/src/kernel/next/tools/testing/selftests/landlock'
> > > make[3]: *** No rule to make target
> > > '/home/anders/.cache/tuxmake/builds/78/build/kselftest/landlock/base_test',
> > > needed by 'all'.  Stop.
> > >
> > > I'm building like this:
> > > tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-12
> > > --kconfig defconfig kselftest
> > >
> > > which translates into this make command:
> > > make --silent --keep-going --jobs=32
> > > O=/home/anders/.cache/tuxmake/builds/78/build
> > > INSTALL_PATH=/home/anders/.cache/tuxmake/builds/78/build/kselftest_install
> > > ARCH=x86_64 CROSS_COMPILE=x86_64-linux-gnu- kselftest-install
> >
> > This works well for me.
>
> Interesting

I used this command (inspired by yours):

make --silent --keep-going --jobs=32 "O=${HOME}/build" 
"INSTALL_PATH=${HOME}/build/kselftest_install" ARCH=x86_64 
CROSS_COMPILE=x86_64-linux-gnu- kselftest-install

Can you run this command without using tuxmake?


> > Which commit is checkout?
>
> I used the latest next tag, I tried to on todays tag as well
> next-20220822 and I see
> the same issue.
> building without 'O=...' I can build the landlock tests...

Can you test it with Linux v5.19 and v6.0-rc2 and see if there is a 
difference?

Is your workspace clean?
What is the version of your make?

Can you replace this line from the Makefile with static names?
"src_test := $(wildcard *_test.c)"



> > > building without this patch works, see below:
> > >
> > > make[3]: Entering directory
> > > '/home/anders/src/kernel/next/tools/testing/selftests/landlock'
> > > x86_64-linux-gnu-gcc -Wall -O2 -isystem
> > > /home/anders/.cache/tuxmake/builds/77/build/usr/include    base_test.c
> > >    -o /home/anders/.cache/tuxmake/builds/77/build/kselftest/landlock/base_test
> > > -lcap
> > > x86_64-linux-gnu-gcc -Wall -O2 -isystem
> > > /home/anders/.cache/tuxmake/builds/77/build/usr/include    fs_test.c
> > > -o /home/anders/.cache/tuxmake/builds/77/build/kselftest/landlock/fs_test
> > > -lcap
> > > x86_64-linux-gnu-gcc -Wall -O2 -isystem
> > > /home/anders/.cache/tuxmake/builds/77/build/usr/include
> > > ptrace_test.c  -o
> > > /home/anders/.cache/tuxmake/builds/77/build/kselftest/landlock/ptrace_test
> > > -lcap
> > > x86_64-linux-gnu-gcc -Wall -O2 -isystem
> > > /home/anders/.cache/tuxmake/builds/77/build/usr/include    true.c  -o
> > > /home/anders/.cache/tuxmake/builds/77/build/kselftest/landlock/true
> > > -static
> > > make[3]: Leaving directory
> > > '/home/anders/src/kernel/next/tools/testing/selftests/landlock'
> > Does this work if you revert this patch, commit a917dd94b832
> > ("selftests/landlock: drop deprecated headers dependency") and commit
> > f2745dc0ba3d ("selftests: stop using KSFT_KHDR_INSTALL")?
> >
> > This patch mainly revert commit a917dd94b832, so I don't see the issue.
> >
> >
> > > Cheers,
> > > Anders
> > >
> > > > ---
> > > >    tools/testing/selftests/landlock/Makefile | 7 +++++--
> > > >    1 file changed, 5 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/tools/testing/selftests/landlock/Makefile b/tools/testing/selftests/landlock/Makefile
> > > > index a6959df28eb0..02868ac3bc71 100644
> > > > --- a/tools/testing/selftests/landlock/Makefile
> > > > +++ b/tools/testing/selftests/landlock/Makefile
> > > > @@ -9,10 +9,13 @@ TEST_GEN_PROGS := $(src_test:.c=)
> > > >    TEST_GEN_PROGS_EXTENDED := true
> > > >
> > > >    OVERRIDE_TARGETS := 1
> > > > +top_srcdir := ../../../..
> > > >    include ../lib.mk
> > > >
> > > > +khdr_dir = $(top_srcdir)/usr/include
> > > > +
> > > >    $(OUTPUT)/true: true.c
> > > >           $(LINK.c) $< $(LDLIBS) -o $@ -static
> > > >
> > > > -$(OUTPUT)/%_test: %_test.c ../kselftest_harness.h common.h
> > > > -       $(LINK.c) $< $(LDLIBS) -o $@ -lcap
> > > > +$(OUTPUT)/%_test: %_test.c $(khdr_dir)/linux/landlock.h ../kselftest_harness.h common.h
> > > > +       $(LINK.c) $< $(LDLIBS) -o $@ -lcap -I$(khdr_dir)
> > > > --
> > > > 2.30.2