linux-kernel - Re: [PATCH net-next v7 5/6] stmmac: dwmac-mediatek: add support for mt8195

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Date:   Wed, 8 Dec 2021 17:51:42 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Biao Huang <biao.huang@...iatek.com>
Cc:     <davem@...emloft.net>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <srv_heupstream@...iatek.com>, <macpaul.lin@...iatek.com>,
        <angelogioacchino.delregno@...labora.com>, <dkirjanov@...e.de>
Subject: Re: [PATCH net-next v7 5/6] stmmac: dwmac-mediatek: add support for
 mt8195

On Thu, 9 Dec 2021 09:48:25 +0800 Biao Huang wrote:
> Sorry for some typo in previous reply, fix it here.
> 
> All these warning lines share a similar semantics:
> delay_val |= FIELD_PREP(xxx, !!val);
> 
> and, should come from the expansion of FIELD_PREP in
> include/linux/bitfiled.h:
> 
>   FIELD _PREP --> __BF_FILED_CHECK --> "~((_mask) >> __bf_shf(_mask)) &
> (_val) : 0,"
> 
> ===============================================================
> __BF_FILED_CHECK {
> ...
>   BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?           \
>                    ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \
>                    _pfx "value too large for the field"); \ ...
> ===============================================================
> 
> Should I fix it by converting
>   delay_val |= FIELD_PREP(ETH_DLY_TXC_ENABLE, !!mac_delay->tx_delay);
> to
>   en_val = !!mac_delay->tx_delay;
>   delay_val |= FIELD_PREP(ETH_DLY_TXC_ENABLE, en_val);
> 
> or other suggestions for these warnings?

I see, thanks for explaining. The code is fine, we can simply ignore
this warning IMHO.