hen Hemminger <shemminger@osdl.org> 1147126289 -0700
committer Stephen Hemminger <shemminger@osdl.org> 1147129227 -0700

sky2: use mask instead of modulo operation

Gcc isn't smart enough to know that it can do a modulo
operation with power of 2 constant by doing a mask.
So add macro to do it for us.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
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