linux-kernel - Re: [PATCH] mwifiex: Remove unnecessary braces from HostCmd_SET_SEQ_NO_BSS

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Message-ID: <0101017467af484e-3cb25a00-4120-4134-a519-be68ab3a49ca-000000@us-west-2.amazonses.com>
Date:   Mon, 7 Sep 2020 08:29:34 +0000
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>,
        Andy Lavr <andy.lavr@...il.com>
Subject: Re: [PATCH] mwifiex: Remove unnecessary braces from
 HostCmd_SET_SEQ_NO_BSS_INFO

Nathan Chancellor <natechancellor@...il.com> wrote:

> A new warning in clang points out when macro expansion might result in a
> GNU C statement expression. There is an instance of this in the mwifiex
> driver:
> 
> drivers/net/wireless/marvell/mwifiex/cmdevt.c:217:34: warning: '}' and
> ')' tokens terminating statement expression appear in different macro
> expansion contexts [-Wcompound-token-split-by-macro]
>         host_cmd->seq_num = cpu_to_le16(HostCmd_SET_SEQ_NO_BSS_INFO
>                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/marvell/mwifiex/fw.h:519:46: note: expanded from
> macro 'HostCmd_SET_SEQ_NO_BSS_INFO'
>         (((type) & 0x000f) << 12);                  }
>                                                     ^
> 
> This does not appear to be a real issue. Removing the braces and
> replacing them with parentheses will fix the warning and not change the
> meaning of the code.
> 
> Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1146
> Reported-by: Andy Lavr <andy.lavr@...il.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

Patch applied to wireless-drivers-next.git, thanks.

6a953dc4dbd1 mwifiex: Remove unnecessary braces from HostCmd_SET_SEQ_NO_BSS_INFO

-- 
https://patchwork.kernel.org/patch/11747495/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches