linux-kernel - Re: [PATCH net-next 08/11] ath9k: work around false-positive gcc warning

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Message-Id: <20201110181359.143D8C43382@smtp.codeaurora.org>
Date:   Tue, 10 Nov 2020 18:13:59 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     QCA ath9k Development <ath9k-devel@....qualcomm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 08/11] ath9k: work around false-positive gcc
 warning

Arnd Bergmann <arnd@...nel.org> wrote:

> gcc-10 shows a false-positive warning with CONFIG_KASAN:
> 
> drivers/net/wireless/ath/ath9k/dynack.c: In function 'ath_dynack_sample_tx_ts':
> include/linux/etherdevice.h:290:14: warning: writing 4 bytes into a region of size 0 [-Wstringop-overflow=]
>   290 |  *(u32 *)dst = *(const u32 *)src;
>       |  ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
> 
> Until gcc is fixed, work around this by using memcpy() in place
> of ether_addr_copy(). Hopefully gcc-11 will not have this problem.
> 
> Link: https://godbolt.org/z/sab1MK
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97490
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> [kvalo@...eaurora.org: remove ifdef and add a comment]
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

b96fab4e3602 ath9k: work around false-positive gcc warning

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20201026213040.3889546-8-arnd@kernel.org/

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