linux-kernel - Re: [PATCH v2] net: ethernet: sun4i-emac: replace magic number with macro

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Date:   Mon, 10 Jan 2022 14:31:28 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Conley Lee <conleylee@...mail.com>
Cc:     davem@...emloft.net, kuba@...nel.org, mripard@...nel.org,
        wens@...e.org, clabbe.montjoie@...il.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: ethernet: sun4i-emac: replace magic number with
 macro

> @@ -637,7 +637,9 @@ static void emac_rx(struct net_device *dev)
>  		if (!rxcount) {
>  			db->emacrx_completed_flag = 1;
>  			reg_val = readl(db->membase + EMAC_INT_CTL_REG);
> -			reg_val |= (0xf << 0) | (0x01 << 8);
> +			reg_val |=
> +				(EMAC_INT_CTL_TX_EN | EMAC_INT_CTL_TX_ABRT_EN |
> +				 EMAC_INT_CTL_RX_EN);

Putting the first value on the next line is a bit odd. This would be
preferred:

+			reg_val |= (EMAC_INT_CTL_TX_EN |
+                                   EMAC_INT_CTL_TX_ABRT_EN |
+				    EMAC_INT_CTL_RX_EN);

I also have to wonder why two | have become three? (0x01 << 8) is
clearly a single value. (0xf << 0) should either be a single macro, or
4 macros since 0xf is four bits. Without looking into the details, i
cannot say this is wrong, but it does look strange.

       Andrew