linux-kernel - Re: [PATCH net-next 1/2] net: stmmac: fix unsafe MTL DMA macro

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Date:   Mon, 24 Oct 2022 21:00:19 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Junxiao Chang <junxiao.chang@...el.com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, mcoquelin.stm32@...il.com,
        Joao.Pinto@...opsys.com, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] net: stmmac: fix unsafe MTL DMA macro

On Fri, 21 Oct 2022 19:47:10 +0800 Junxiao Chang wrote:
> Macro like "#define abc(x) (x, x)" is unsafe which might introduce
> side effects. Each MTL RxQ DMA channel mask is 4 bits, so using
> (0xf << chan) instead of GENMASK(x + 3, x) to avoid unsafe macro.
> 
> Fixes: d43042f4da3e ("net: stmmac: mapping mtl rx to dma channel")

You need to point out an existing usage where this is causing problems,
otherwise this is not a fix.

And squash the two patches together, it's going to be easier to review.