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Subject: Re: [PATCH] hostap: hide unused procfs helpers
To:     YueHaibing <yuehaibing@huawei.com>, j@w1.fi, kvalo@codeaurora.org
References: <20180713070317.6724-1-yuehaibing@huawei.com>
Cc:     linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        linux-wireless@vger.kernel.org, davem@davemloft.net,
        Randy Dunlap <rdunlap@infradead.org>
From:   Arend van Spriel <arend.vanspriel@broadcom.com>
Message-ID: <5B485441.1080305@broadcom.com>
Date:   Fri, 13 Jul 2018 09:26:57 +0200
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+ Randy

On 7/13/2018 9:03 AM, YueHaibing wrote:
> When CONFIG_PROC_FS isn't set, gcc warning this:
>
> drivers/net/wireless/intersil/hostap/hostap_hw.c:2901:12: warning: ‘prism2_registers_proc_show’ defined but not used [-Wunused-function]
>   static int prism2_registers_proc_show(struct seq_file *m, void *v)
>
> drivers/net/wireless/intersil/hostap/hostap_proc.c:16:12: warning: ‘prism2_debug_proc_show’ defined but not used [-Wunused-function]
>   static int prism2_debug_proc_show(struct seq_file *m, void *v)
>              ^
> drivers/net/wireless/intersil/hostap/hostap_proc.c:49:12: warning: ‘prism2_stats_proc_show’ defined but not used [-Wunused-function]
>   static int prism2_stats_proc_show(struct seq_file *m, void *v)
>              ^
> drivers/net/wireless/intersil/hostap/hostap_proc.c:177:12: warning: ‘prism2_crypt_proc_show’ defined but not used [-Wunused-function]
>   static int prism2_crypt_proc_show(struct seq_file *m, void *v)
>              ^
>
> fix this by adding #ifdef around them.
> hfa384x_read_reg is only used by prism2_registers_proc_show,so move it
> into #ifdef.

There was already a fix for this posted by Randy Dunlap taking a 
different approach, ie. use __maybe_unused classifier. To be honest I 
prefer the ifdef approach as it is more explicit and does not feel like 
a cheat.

Actually some of the functions are between a flag already 
PRISM2_NO_PROCFS_DEBUG which is in a private header file 
hostap_config.h. Seems like this would be better placed in Kconfig and 
depend on CONFIG_PROCFS. Anyway, this driver is old cruft. Maybe some 
people are still running it, but it is probably not worth the effort so 
fine with either fix.

Regards,
Arend