linux-kernel - Re: [PATCH 4/14] audit: avoid missing-prototype warnings

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Date:   Wed, 17 May 2023 10:33:52 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Michal Simek <monstr@...str.eu>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Helge Deller <deller@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Palmer Dabbelt <palmer@...belt.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Eric Paris <eparis@...hat.com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        audit@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com
Subject: Re: [PATCH 4/14] audit: avoid missing-prototype warnings

On May 17, 2023 Arnd Bergmann <arnd@...nel.org> wrote:
> 
> Building with 'make W=1' reveals two function definitions without
> a previous prototype in the audit code:
> 
> lib/compat_audit.c:32:5: error: no previous prototype for 'audit_classify_compat_syscall' [-Werror=missing-prototypes]
> kernel/audit.c:1813:14: error: no previous prototype for 'audit_serial' [-Werror=missing-prototypes]
> 
> The first one needs a declaration from linux/audit.h but cannot
> include that header without causing conflicting (compat) syscall number
> definitions, so move the it into linux/audit_arch.h.
> 
> The second one is declared conditionally based on CONFIG_AUDITSYSCALL
> but needed as a local function even when that option is disabled, so
> move the declaration out of the #ifdef block.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/audit.h      | 2 --
>  include/linux/audit_arch.h | 2 ++
>  kernel/audit.h             | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/audit.h b/include/linux/audit.h
> index 31086a72e32a..6a3a9e122bb5 100644
> --- a/include/linux/audit.h
> +++ b/include/linux/audit.h
> @@ -130,8 +130,6 @@ extern unsigned compat_dir_class[];
>  extern unsigned compat_chattr_class[];
>  extern unsigned compat_signal_class[];
>  
> -extern int audit_classify_compat_syscall(int abi, unsigned syscall);
> -
>  /* audit_names->type values */
>  #define	AUDIT_TYPE_UNKNOWN	0	/* we don't know yet */
>  #define	AUDIT_TYPE_NORMAL	1	/* a "normal" audit record */
> diff --git a/include/linux/audit_arch.h b/include/linux/audit_arch.h
> index 8fdb1afe251a..0e34d673ef17 100644
> --- a/include/linux/audit_arch.h
> +++ b/include/linux/audit_arch.h
> @@ -21,4 +21,6 @@ enum auditsc_class_t {
>  	AUDITSC_NVALS /* count */
>  };
>  
> +extern int audit_classify_compat_syscall(int abi, unsigned syscall);
> +
>  #endif
> diff --git a/kernel/audit.h b/kernel/audit.h
> index c57b008b9914..94738bce40b2 100644
> --- a/kernel/audit.h
> +++ b/kernel/audit.h
> @@ -259,8 +259,8 @@ extern struct tty_struct *audit_get_tty(void);
>  extern void audit_put_tty(struct tty_struct *tty);
>  
>  /* audit watch/mark/tree functions */
> -#ifdef CONFIG_AUDITSYSCALL
>  extern unsigned int audit_serial(void);
> +#ifdef CONFIG_AUDITSYSCALL
>  extern int auditsc_get_stamp(struct audit_context *ctx,
>  			      struct timespec64 *t, unsigned int *serial);

We probably should move the audit_serial() and auditsc_get_stamp()
away from the watch/mark/tree functions, but that isn't your problem.

Anyway, this looks okay to me; do you have a problem if I merge this
via the audit/next branch or were you hoping to have this go in
through a different tree?

--
paul-moore.com