linux-kernel - Re: [PATCH] syscalls: add sys_ni_posix

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Date:   Sat, 10 Jun 2023 14:06:42 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Arnd Bergmann <arnd@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Richard Henderson <richard.henderson@...aro.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Kees Cook <keescook@...omium.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Borislav Petkov <bp@...e.de>, Jann Horn <jannh@...gle.com>,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH] syscalls: add sys_ni_posix_timers prototype

On Wed, Jun 07 2023 at 16:28, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> The sys_ni_posix_timers() definition causes a warning when
> the declaration is missing, so this needs to be added
> along with the normal syscalls, outside of the #ifdef.
>
> kernel/time/posix-stubs.c:26:17: error: no previous prototype for 'sys_ni_posix_timers' [-Werror=missing-prototypes]
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> I missed sending this out in the initial submission of my Wmissing-prototype patches
> ---
>  arch/alpha/kernel/osf_sys.c | 2 --
>  include/linux/syscalls.h    | 1 +
>  kernel/time/posix-stubs.c   | 1 +
>  3 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
> index 2a9a877a05083..d98701ee36c6a 100644
> --- a/arch/alpha/kernel/osf_sys.c
> +++ b/arch/alpha/kernel/osf_sys.c
> @@ -1014,8 +1014,6 @@ SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv,
>  	return do_sys_settimeofday64(tv ? &kts : NULL, tz ? &ktz : NULL);
>  }
>  
> -asmlinkage long sys_ni_posix_timers(void);
> -
>  SYSCALL_DEFINE2(osf_utimes, const char __user *, filename,
>  		struct timeval32 __user *, tvs)
>  {
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index 4627b9cf4b4d9..712f4e1dc6a69 100644
> --- a/include/linux/syscalls.h
> +++ b/include/linux/syscalls.h
> @@ -1286,6 +1286,7 @@ asmlinkage long sys_ni_syscall(void);
>  
>  #endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
>  
> +asmlinkage long sys_ni_posix_timers(void);
>  
>  /*
>   * Kernel code should not call syscalls (i.e., sys_xyzyyz()) directly.
> diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
> index 828aeecbd1e8a..39769b2d1005e 100644
> --- a/kernel/time/posix-stubs.c
> +++ b/kernel/time/posix-stubs.c
> @@ -16,6 +16,7 @@
>  #include <linux/posix-timers.h>
>  #include <linux/time_namespace.h>
>  #include <linux/compat.h>
> +#include <linux/syscalls.h>

That's already included. I'll fix it up while applying.