linux-kernel - Re: [PATCH 03/32] dmaengine: ste_dma40: Use the BIT macro to replace ugly '(1 << x)'s

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Date:	Thu, 18 Apr 2013 11:43:38 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Rabin Vincent <rabin@....in>, linus.walleij@...ricsson.com,
	arnd@...db.de, Vinod Koul <vinod.koul@...el.com>,
	Per Forlin <per.forlin@...ricsson.com>,
	Dan Williams <djbw@...com>
Subject: Re: [PATCH 03/32] dmaengine: ste_dma40: Use the BIT macro to
	replace ugly '(1 << x)'s

On Thu, Apr 18, 2013 at 11:11:45AM +0100, Lee Jones wrote:
> The aim is to make the code that little more readable.

Maybe we should also invent the MULT() macro too, because a * b is just
too ugly as well?  Maybe ADD(), SUB() and DIV() macros as well...  Think
of all those extra parens you could use! :)

> @@ -1448,7 +1448,7 @@ static u32 d40_residue(struct d40_chan *d40c)
>  			  >> D40_SREG_ELEM_PHY_ECNT_POS;
>  	}
>  
> -	return num_elt * (1 << d40c->dma_cfg.dst_info.data_width);
> +	return num_elt * BIT(d40c->dma_cfg.dst_info.data_width);

This should be:
	return num_elt << d40c->dma_cfg.dst_info.data_width;
--
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