linux-kernel - Re: [PATCH 08/11] mt76: Fix undefined behavior due to shift overflowing the constant

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Message-ID: <87fsmqrckm.fsf@kernel.org>
Date:   Wed, 06 Apr 2022 08:43:53 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, Felix Fietkau <nbd@....name>,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 08/11] mt76: Fix undefined behavior due to shift overflowing the constant

Borislav Petkov <bp@...en8.de> writes:

> From: Borislav Petkov <bp@...e.de>
>
> Fix:
>
>   drivers/net/wireless/mediatek/mt76/mt76x2/pci.c: In function ‘mt76x2e_probe’:
>   ././include/linux/compiler_types.h:352:38: error: call to ‘__compiletime_assert_946’ \
> 	declared with attribute error: FIELD_PREP: mask is not constant
>     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>
> See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory
> details as to why it triggers with older gccs only.
>
> Signed-off-by: Borislav Petkov <bp@...e.de>

As this fixes a compiler warning in Linus' tree, I would like to take
this to wireless tree and I assigned this to myself in patchwork.

Felix, ack?

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

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