netdev - Re: [PATCH net-next v2] net/smc: fix compile warning for smc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220304213151.04ecbe8f@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 4 Mar 2022 21:31:51 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Dust Li <dust.li@...ux.alibaba.com>
Cc:     Karsten Graul <kgraul@...ux.ibm.com>,
        Tony Lu <tonylu@...ux.alibaba.com>, davem@...emloft.net,
        netdev@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next v2] net/smc: fix compile warning for smc_sysctl

On Thu,  3 Mar 2022 16:40:06 +0800 Dust Li wrote:
> kernel test robot reports multiple warning for smc_sysctl:
> 
>   In file included from net/smc/smc_sysctl.c:17:
> >> net/smc/smc_sysctl.h:23:5: warning: no previous prototype \  
> 	for function 'smc_sysctl_init' [-Wmissing-prototypes]
>   int smc_sysctl_init(void)
>        ^
> and
>   >> WARNING: modpost: vmlinux.o(.text+0x12ced2d): Section mismatch \  
>   in reference from the function smc_sysctl_exit() to the variable
>   .init.data:smc_sysctl_ops
>   The function smc_sysctl_exit() references
>   the variable __initdata smc_sysctl_ops.
>   This is often because smc_sysctl_exit lacks a __initdata
>   annotation or the annotation of smc_sysctl_ops is wrong.
> 
> and
>   net/smc/smc_sysctl.c: In function 'smc_sysctl_init_net':
>   net/smc/smc_sysctl.c:47:17: error: 'struct netns_smc' has no member named 'smc_hdr'
>      47 |         net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
> 
> Since we don't need global sysctl initialization. To make things
> clean and simple, remove the global pernet_operations and
> smc_sysctl_{init|exit}. Call smc_sysctl_net_{init|exit} directly
> from smc_net_{init|exit}.
> 
> Also initialized sysctl_autocorking_size if CONFIG_SYSCTL it not
> set, this makes sure SMC autocorking is enabled by default if
> CONFIG_SYSCTL is not set.

I think that makes sense, one nit below.

> -static __net_init int smc_sysctl_init_net(struct net *net)
> +int smc_sysctl_net_init(struct net *net)
>  {
>  	struct ctl_table *table;
>  
> @@ -59,22 +59,7 @@ static __net_init int smc_sysctl_init_net(struct net *net)
>  	return -ENOMEM;
>  }
>  
> -static __net_exit void smc_sysctl_exit_net(struct net *net)
> +void smc_sysctl_net_exit(struct net *net)
>  {
>  	unregister_net_sysctl_table(net->smc.smc_hdr);
>  }

> +int smc_sysctl_net_init(struct net *net);
> +void smc_sysctl_net_exit(struct net *net);

I believe these functions can become / remain __net_init and __net_exit,
since all the callers are also marked as such.

>  #else
>  
> -int smc_sysctl_init(void)
> +static inline int smc_sysctl_net_init(struct net *net)
>  {
> +	net->smc.sysctl_autocorking_size = SMC_AUTOCORKING_DEFAULT_SIZE;
>  	return 0;
>  }
>  
> -void smc_sysctl_exit(void) { }
> +static inline void smc_sysctl_net_exit(struct net *net) { }

Doesn't matter for static inlines.

>  #endif /* CONFIG_SYSCTL */
>