[alsa-devel] [PATCH] ASoC: Avoid recalculating the bitmask for SOC_ENUM controls
broonie at opensource.wolfsonmicro.com
Wed Sep 19 04:51:14 CEST 2012
On Fri, Sep 14, 2012 at 01:57:27PM +0200, Lars-Peter Clausen wrote:
> For ENUM controls the bitmask is calculated based on the number of items.
> Currently this is done each time the control is accessed. And while the
> performance impact of this should be negligible we can easily do better. The
> roundup_pow_of_two macro performs the same calculation which is currently done
> manually, but it is also possible to use this macro with compile time constants
> and so it can be used to initialize static data. So we can use it to initialize
> the mask field of a ENUM control during its declaration.
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