linux-kernel - Re: [PATCH] net/llc/llc_conn.c: fix 4 instances of -Wmissing-variable-declarations

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Date:   Wed, 9 Aug 2023 14:59:51 +0200
From:   Simon Horman <horms@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Tom Rix <trix@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        kernel test robot <lkp@...el.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: Re: [PATCH] net/llc/llc_conn.c: fix 4 instances of
 -Wmissing-variable-declarations

+ Kuniyuki Iwashima

On Tue, Aug 08, 2023 at 09:43:09AM -0700, Nick Desaulniers wrote:
> I'm looking to enable -Wmissing-variable-declarations behind W=1. 0day
> bot spotted the following instances:
> 
>   net/llc/llc_conn.c:44:5: warning: no previous extern declaration for
>   non-static variable 'sysctl_llc2_ack_timeout'
>   [-Wmissing-variable-declarations]
>   44 | int sysctl_llc2_ack_timeout = LLC2_ACK_TIME * HZ;
>      |     ^
>   net/llc/llc_conn.c:44:1: note: declare 'static' if the variable is not
>   intended to be used outside of this translation unit
>   44 | int sysctl_llc2_ack_timeout = LLC2_ACK_TIME * HZ;
>      | ^
>   net/llc/llc_conn.c:45:5: warning: no previous extern declaration for
>   non-static variable 'sysctl_llc2_p_timeout'
>   [-Wmissing-variable-declarations]
>   45 | int sysctl_llc2_p_timeout = LLC2_P_TIME * HZ;
>      |     ^
>   net/llc/llc_conn.c:45:1: note: declare 'static' if the variable is not
>   intended to be used outside of this translation unit
>   45 | int sysctl_llc2_p_timeout = LLC2_P_TIME * HZ;
>      | ^
>   net/llc/llc_conn.c:46:5: warning: no previous extern declaration for
>   non-static variable 'sysctl_llc2_rej_timeout'
>   [-Wmissing-variable-declarations]
>   46 | int sysctl_llc2_rej_timeout = LLC2_REJ_TIME * HZ;
>      |     ^
>   net/llc/llc_conn.c:46:1: note: declare 'static' if the variable is not
>   intended to be used outside of this translation unit
>   46 | int sysctl_llc2_rej_timeout = LLC2_REJ_TIME * HZ;
>      | ^
>   net/llc/llc_conn.c:47:5: warning: no previous extern declaration for
>   non-static variable 'sysctl_llc2_busy_timeout'
>   [-Wmissing-variable-declarations]
>   47 | int sysctl_llc2_busy_timeout = LLC2_BUSY_TIME * HZ;
>      |     ^
>   net/llc/llc_conn.c:47:1: note: declare 'static' if the variable is not
>   intended to be used outside of this translation unit
>   47 | int sysctl_llc2_busy_timeout = LLC2_BUSY_TIME * HZ;
>      | ^
> 
> These symbols are referenced by more than one translation unit, so make
> include the correct header for their declarations. Finally, sort the
> list of includes to help keep them tidy.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/llvm/202308081000.tTL1ElTr-lkp@intel.com/
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>

Reviewed-by: Simon Horman <horms@...nel.org>

> ---
>  net/llc/llc_conn.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
> index d037009ee10f..0a3f5e0bec00 100644
> --- a/net/llc/llc_conn.c
> +++ b/net/llc/llc_conn.c
> @@ -14,14 +14,15 @@
>  
>  #include <linux/init.h>
>  #include <linux/slab.h>
> -#include <net/llc_sap.h>
> -#include <net/llc_conn.h>
> -#include <net/sock.h>
> -#include <net/tcp_states.h>
> -#include <net/llc_c_ev.h>
> +#include <net/llc.h>
>  #include <net/llc_c_ac.h>
> +#include <net/llc_c_ev.h>
>  #include <net/llc_c_st.h>
> +#include <net/llc_conn.h>
>  #include <net/llc_pdu.h>
> +#include <net/llc_sap.h>
> +#include <net/sock.h>
> +#include <net/tcp_states.h>
>  
>  #if 0
>  #define dprintk(args...) printk(KERN_DEBUG args)
> 
> ---
> base-commit: 14f9643dc90adea074a0ffb7a17d337eafc6a5cc
> change-id: 20230808-llc_static-de4dddcc64b4
> 
> Best regards,
> -- 
> Nick Desaulniers <ndesaulniers@...gle.com>
> 
>