linux-kernel - Re: [PATCH] wifi: b43: fix incorrect _

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Message-ID: <ZGNiZtG38Kr5M2uW@corigine.com>
Date:   Tue, 16 May 2023 13:00:54 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Kalle Valo <kvalo@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        "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>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-wireless@...r.kernel.org,
        b43-dev@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] wifi: b43: fix incorrect __packed annotation

On Tue, May 16, 2023 at 09:45:42AM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang warns about an unpacked structure inside of a packed one:
> 
> drivers/net/wireless/broadcom/b43/b43.h:654:4: error: field data within 'struct b43_iv' is less aligned than 'union (unnamed union at /home/arnd/arm-soc/drivers/net/wireless/broadcom/b43/b43.h:651:2)' and is usually due to 'struct b43_iv' being packed, which can lead to unaligned accesses [-Werror,-Wunaligned-access]
> 
> The problem here is that the anonymous union has the default alignment
> from its members, apparently because the original author mixed up the
> placement of the __packed attribute by placing it next to the struct
> member rather than the union definition. As the struct itself is
> also marked as __packed, there is no need to mark its members, so just
> move the annotation to the inner type instead.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Simon Horman <simon.horman@...igine.com>