linux-kernel - Re: [PATCH v2 2/2] tests: add close

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Date:   Tue, 28 May 2019 11:57:56 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        torvalds@...ux-foundation.org, fweimer@...hat.com,
        jannh@...gle.com, oleg@...hat.com, tglx@...utronix.de,
        arnd@...db.de, shuah@...nel.org, dhowells@...hat.com,
        tkjos@...roid.com, ldv@...linux.org, miklos@...redi.hu,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linux-arch@...r.kernel.org,
        linux-kselftest@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2 2/2] tests: add close_range() tests

On Tue, May 28, 2019 at 12:33:41PM +1000, Michael Ellerman wrote:
> Christian Brauner <christian@...uner.io> writes:
> > This adds basic tests for the new close_range() syscall.
> > - test that no invalid flags can be passed
> > - test that a range of file descriptors is correctly closed
> > - test that a range of file descriptors is correctly closed if there there
> >   are already closed file descriptors in the range
> > - test that max_fd is correctly capped to the current fdtable maximum
> >
> > Signed-off-by: Christian Brauner <christian@...uner.io>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: Jann Horn <jannh@...gle.com>
> > Cc: David Howells <dhowells@...hat.com>
> > Cc: Dmitry V. Levin <ldv@...linux.org>
> > Cc: Oleg Nesterov <oleg@...hat.com>
> > Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> > Cc: Florian Weimer <fweimer@...hat.com>
> > Cc: linux-api@...r.kernel.org
> > ---
> > v1: unchanged
> > v2:
> > - Christian Brauner <christian@...uner.io>:
> >   - verify that close_range() correctly closes a single file descriptor
> > ---
> >  tools/testing/selftests/Makefile              |   1 +
> >  tools/testing/selftests/core/.gitignore       |   1 +
> >  tools/testing/selftests/core/Makefile         |   6 +
> >  .../testing/selftests/core/close_range_test.c | 142 ++++++++++++++++++
> >  4 files changed, 150 insertions(+)
> >  create mode 100644 tools/testing/selftests/core/.gitignore
> >  create mode 100644 tools/testing/selftests/core/Makefile
> >  create mode 100644 tools/testing/selftests/core/close_range_test.c
> >
> > diff --git a/tools/testing/selftests/core/.gitignore b/tools/testing/selftests/core/.gitignore
> > new file mode 100644
> > index 000000000000..6e6712ce5817
> > --- /dev/null
> > +++ b/tools/testing/selftests/core/.gitignore
> > @@ -0,0 +1 @@
> > +close_range_test
> > diff --git a/tools/testing/selftests/core/Makefile b/tools/testing/selftests/core/Makefile
> > new file mode 100644
> > index 000000000000..de3ae68aa345
> > --- /dev/null
> > +++ b/tools/testing/selftests/core/Makefile
> > @@ -0,0 +1,6 @@
> > +CFLAGS += -g -I../../../../usr/include/ -I../../../../include
> 
> Your second -I pulls the unexported kernel headers in, userspace
> programs shouldn't include unexported kernel headers.
> 
> It breaks the build on powerpc with eg:
> 
>   powerpc64le-linux-gnu-gcc -g -I../../../../usr/include/ -I../../../../include    close_range_test.c  -o /output/kselftest/core/close_range_test
>   In file included from /usr/powerpc64le-linux-gnu/include/bits/fcntl-linux.h:346,
>                    from /usr/powerpc64le-linux-gnu/include/bits/fcntl.h:62,
>                    from /usr/powerpc64le-linux-gnu/include/fcntl.h:35,
>                    from close_range_test.c:5:
>   ../../../../include/linux/falloc.h:13:2: error: unknown type name '__s16'
>     __s16  l_type;
>     ^~~~~
> 
> 
> Did you do that on purpose or just copy it from one of the other
> Makefiles? :)

I originally did that on purpose because checkpatch was yammering on
about me not having used ARRAY_SIZE(). But that include can go, you are
right.

Christian