linux-kernel - Re: [PATCH] selftests: pidfd: Fix compiling errors and warning

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Message-ID: <Z6OV-1CTAcK3RS4e@vaxr-BM6660-BM6360>
Date: Thu, 6 Feb 2025 00:46:51 +0800
From: I Hsin Cheng <richard120310@...il.com>
To: Peter Seiderer <ps.report@....net>
Cc: shuah@...nel.org, brauner@...nel.org, linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] selftests: pidfd: Fix compiling errors and warning

On Wed, Feb 05, 2025 at 01:07:56PM +0100, Peter Seiderer wrote:
> Hello *,
> 
> On Wed,  5 Feb 2025 13:39:26 +0800, I Hsin Cheng <richard120310@...il.com> wrote:
> 
> > When compiling selftests files under tools/testing/selftests/pidfd/ ,
> > some compiling errors and warnings will pop out as the following.
> > 
> >   CC       pidfd_fdinfo_test
> > pidfd_fdinfo_test.c: In function ‘child_fdinfo_nspid_test’:
> > pidfd_fdinfo_test.c:231:13: warning: implicit declaration of function \
> > ‘mount’ [-Wimplicit-function-declaration]
> >   231 |         r = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
> >       |             ^~~~~
> > pidfd_fdinfo_test.c:231:36: error: ‘MS_REC’ undeclared \
> > (first use in this function)
> >   231 |         r = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
> >       |                                    ^~~~~~
> > pidfd_fdinfo_test.c:231:36: note: each undeclared identifier is \
> > reported only once for each function it appears in
> > pidfd_fdinfo_test.c:231:45: error: ‘MS_PRIVATE’ undeclared \
> > (first use in this function); did you mean ‘MAP_PRIVATE’?
> >   231 |         r = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0);
> >       |                                             ^~~~~~~~~~
> >       |                                             MAP_PRIVATE
> > pidfd_fdinfo_test.c:237:15: warning: implicit declaration of function \
> > ‘umount2’; did you mean ‘SYS_umount2’? \
> > [-Wimplicit-function-declaration]
> >   237 |         (void)umount2("/proc", MNT_DETACH);
> >       |               ^~~~~~~
> >       |               SYS_umount2
> > pidfd_fdinfo_test.c:237:32: error: ‘MNT_DETACH’ undeclared \
> > (first use in this function)
> >   237 |         (void)umount2("/proc", MNT_DETACH);
> >       |                                ^~~~~~~~~~
> > make: *** [../lib.mk:222: \
> > ~/linux/tools/testing/selftests/pidfd/pidfd_fdinfo_test] Error 1
> > 
> > Solve these errors and warnings by including header file <sys/mount.h>.
> > 
> > Signed-off-by: I Hsin Cheng <richard120310@...il.com>
> > ---
> >  tools/testing/selftests/pidfd/pidfd_fdinfo_test.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/tools/testing/selftests/pidfd/pidfd_fdinfo_test.c b/tools/testing/selftests/pidfd/pidfd_fdinfo_test.c
> > index f062a986e..f718aac75 100644
> > --- a/tools/testing/selftests/pidfd/pidfd_fdinfo_test.c
> > +++ b/tools/testing/selftests/pidfd/pidfd_fdinfo_test.c
> > @@ -13,6 +13,7 @@
> >  #include <syscall.h>
> >  #include <sys/wait.h>
> >  #include <sys/mman.h>
> > +#include <sys/mount.h>
> >  
> >  #include "pidfd.h"
> >  #include "../kselftest.h"
> 
> Predated patch already available, see
> 
> 	https://lore.kernel.org/linux-kselftest/20250115105211.390370-1-ps.report@gmx.net/
>

Hello Peter,

Thanks for the kindly reminder!

Good to know it's already solved, thanks!

Regards,
I Hsin Cheng.

> Regards,
> Peter
>