Re: CVS commit: src/sys/arch/xen/x86

[Jukka Ruohonen <jruohonen%iki.fi@localhost>]

On Thu, Mar 04, 2010 at 12:58:01AM +0900, Izumi Tsutsui wrote:
> They are in <sys/param.h>.
> 
> >> #define howmany(x, y)   (((x)+((y)-1))/(y))
> how many y-byte blocks are required to store x-bytes region?
> 
> >> #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
> >> #define rounddown(x,y)  (((x)/(y))*(y))
> roundup or rounddown x per y, as is?
> 
> >> #define roundup2(x, m)  (((x) + (m) - 1) & ~((m) - 1))
> optimized version (avoid division op) roundup()
> where m is a power of two

Thanks.

Maybe I should have looked before asking... Oh well, maybe the committed
man-page will save someone else from asking stupid questions.

- Jukka.