netdev - Re: [PATCH] wl18xx: Fix Wunused-const-variable

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Message-ID: <87h88ofygd.fsf@codeaurora.org>
Date:   Mon, 17 Jun 2019 10:44:18 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Nathan Huckleberry <nhuck@...gle.com>, eliad@...ery.com,
        arik@...ery.com, "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] wl18xx: Fix Wunused-const-variable

Nick Desaulniers <ndesaulniers@...gle.com> writes:

> On Fri, Jun 14, 2019 at 10:17 AM 'Nathan Huckleberry' via Clang Built
> Linux <clang-built-linux@...glegroups.com> wrote:
>>
>> Clang produces the following warning
>>
>> drivers/net/wireless/ti/wl18xx/main.c:1850:43: warning: unused variable
>> 'wl18xx_iface_ap_cl_limits' [-Wunused-const-variable] static const struct
>> ieee80211_iface_limit wl18xx_iface_ap_cl_limits[] = { ^
>> drivers/net/wireless/ti/wl18xx/main.c:1869:43: warning: unused variable
>> 'wl18xx_iface_ap_go_limits' [-Wunused-const-variable] static const struct
>> ieee80211_iface_limit wl18xx_iface_ap_go_limits[] = { ^
>>
>> The commit that added these variables never used them. Removing them.
>
> Previous thread, for context:
> https://groups.google.com/forum/#!topic/clang-built-linux/1Lu1GT9ic94
>
> Looking at drivers/net/wireless/ti/wl18xx/main.c, there 4 globally
> declared `struct ieee80211_iface_limit` but as your patch notes, only
> 2 are used.  The thing is, their uses are in a `struct
> ieee80211_iface_limit []`.
>
> Looking at
> $ git blame drivers/net/wireless/ti/wl18xx/main.c -L 1850
> points to
> commit 7845af35e0de ("wlcore: add p2p device support")
> Adding Eliad and Arik to the thread; it's not clear to me what the
> these variables were supposed to do, but seeing as the code in
> question was already dead, this is no functional change from a user's
> perspective.  With that in mind:
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
>
> So I'd at least add the tag.
> Fixes: 7845af35e0de ("wlcore: add p2p device support")

I can't see any functional changes when applying this patch so I don't
think a fixes line is needed, it's just cleanup.

-- 
Kalle Valo