netdev - Re: [PATCH 1/2] ravb: factor out register bit twiddling code

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Message-ID: <56B7AFFF.1060005@cogentembedded.com>
Date:	Sun, 7 Feb 2016 23:58:39 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH 1/2] ravb: factor out register bit twiddling code

Hello.

On 02/07/2016 11:48 PM, Geert Uytterhoeven wrote:

>> --- net-next.orig/drivers/net/ethernet/renesas/ravb_main.c
>> +++ net-next/drivers/net/ethernet/renesas/ravb_main.c
>> @@ -2,7 +2,7 @@
>>    *
>>    * Copyright (C) 2014-2015 Renesas Electronics Corporation
>>    * Copyright (C) 2015 Renesas Solutions Corp.
>> - * Copyright (C) 2015 Cogent Embedded, Inc. <source@...entembedded.com>
>> + * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@...entembedded.com>
>>    *
>>    * Based on the SuperH Ethernet driver
>>    *
>> @@ -42,6 +42,12 @@
>>                   NETIF_MSG_RX_ERR | \
>>                   NETIF_MSG_TX_ERR)
>>
>> +void ravb_modify(struct net_device *ndev, enum ravb_reg reg, u32 mask,
>> +                u32 value)
>> +{
>> +       ravb_write(ndev, (ravb_read(ndev, reg) & ~mask) | value, reg);
>> +}
>
> Usually "mask"is used for the bits to keep, not for the bits to clear.
>
> So I'd either
>    1. AND with "mask" instead of "~mask", and update all callers, or
>    2. rename "mask" to "clear", and "value" to "set".

    I'll go with the 2nd option.

> Gr{oetje,eeting}s,
>
>                          Geert

MBR, Sergei