linux-kernel - Re: [PATCHv2 2/5] mmc: sdhci-bcm2835: make shift calculations consistent

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Date:	Tue, 04 Nov 2014 21:48:12 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Scott Branden <sbranden@...adcom.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Peter Griffin <peter.griffin@...aro.org>,
	Chris Ball <chris@...ntf.net>,
	Piotr Krol <pietrushnic@...il.com>
CC:	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Joe Perches <joe@...ches.com>,
	linux-rpi-kernel@...ts.infradead.org, Ray Jui <rjui@...adcom.com>,
	bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCHv2 2/5] mmc: sdhci-bcm2835: make shift calculations consistent

On 10/30/2014 12:36 AM, Scott Branden wrote:
> Make the shift calculations consistent rather than having different
> implementations to calculate the same thing.

> diff --git a/drivers/mmc/host/sdhci-bcm2835.c b/drivers/mmc/host/sdhci-bcm2835.c

> +#define REG_OFFSET_IN_BITS(reg) ((reg) << 3 & 0x18)

This should really be the following so people don't have to memorize
operator precedence:

#define REG_OFFSET_IN_BITS(reg) (((reg) << 3) & 0x18)

(I've been bit by people mis-remembering precedence in very similar code...)
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