linux-kernel - Re: [PATCH v2] selftests: pid_namespace: Add missing sys/mount.h

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Message-ID: <CABdmKX3eyoWx1Lfbak8ekaMHrTSoiK0WwjQmct1dJbFy=21Yow@mail.gmail.com>
Date: Wed, 9 Apr 2025 09:15:12 -0700
From: "T.J. Mercier" <tjmercier@...gle.com>
To: Peter Seiderer <ps.report@....net>
Cc: Christian Brauner <brauner@...nel.org>, Shuah Khan <shuah@...nel.org>, 
	Alexander Mikhalitsyn <alexander@...alicyn.com>, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2] selftests: pid_namespace: Add missing sys/mount.h

On Wed, Apr 9, 2025 at 1:53 AM Peter Seiderer <ps.report@....net> wrote:
>
> Hello T.J.,
>
> On Tue,  8 Apr 2025 23:02:02 +0000, "T.J. Mercier" <tjmercier@...gle.com> wrote:
>
> > pid_max.c: In function ‘pid_max_cb’:
> > pid_max.c:42:15: error: implicit declaration of function ‘mount’
> >                                        [-Wimplicit-function-declaration]
> >    42 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
> >       |               ^~~~~
> > pid_max.c:42:36: error: ‘MS_PRIVATE’ undeclared (first use in this
> >                                   function); did you mean ‘MAP_PRIVATE’?
> >    42 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
> >       |                                    ^~~~~~~~~~
> >       |                                    MAP_PRIVATE
> > pid_max.c:42:49: error: ‘MS_REC’ undeclared (first use in this function)
> >    42 |         ret = mount("", "/", NULL, MS_PRIVATE | MS_REC, 0);
> >       |                                                 ^~~~~~
> > pid_max.c:48:9: error: implicit declaration of function ‘umount2’; did
> >                you mean ‘SYS_umount2’? [-Wimplicit-function-declaration]
> >    48 |         umount2("/proc", MNT_DETACH);
> >       |         ^~~~~~~
> >       |         SYS_umount2
> > pid_max.c:48:26: error: ‘MNT_DETACH’ undeclared (first use in this
> >                                                                function)
> >    48 |         umount2("/proc", MNT_DETACH);
> >
> > Fixes: 615ab43b838b ("tests/pid_namespace: add pid_max tests")
> > Signed-off-by: T.J. Mercier <tjmercier@...gle.com>
> > ---
> >  tools/testing/selftests/pid_namespace/pid_max.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/tools/testing/selftests/pid_namespace/pid_max.c b/tools/testing/selftests/pid_namespace/pid_max.c
> > index 51c414faabb0..96f274f0582b 100644
> > --- a/tools/testing/selftests/pid_namespace/pid_max.c
> > +++ b/tools/testing/selftests/pid_namespace/pid_max.c
> > @@ -10,6 +10,7 @@
> >  #include <stdlib.h>
> >  #include <string.h>
> >  #include <syscall.h>
> > +#include <sys/mount.h>
> >  #include <sys/wait.h>
> >
> >  #include "../kselftest_harness.h"
>
> Predated patch already available, see
>
>         https://lore.kernel.org/linux-kselftest/20250115105211.390370-3-ps.report@gmx.net/
>
> Regards,
> Peter

Thanks Peter, looks like that was never taken into anybody's tree?

You can have my:
Reviewed-by: T.J. Mercier <tjmercier@...gle.com>