Re: [PATCH 03/32] dmaengine: ste_dma40: Use the BIT macro to replaceugly '(1 << x)'s

[Lee Jones]

On Thu, 18 Apr 2013, Russell King - ARM Linux wrote:

> 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! :)

Very amusing. :)

I just happen to like this macro.

It's more for tidiness than readability to be honest, but still.

> > @@ -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;

Thanks. I'll fixup.

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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