On Tue, Mar 20, 2012 at 2:32 PM, Michal Nazarewicz <mina86@xxxxxxxxxx> wrote: > On Tue, 20 Mar 2012 11:21:19 +0100, Lai Jiangshan <laijs@xxxxxxxxxxxxxx> > wrote: > >> Get the biggest 2**y that x % (2**y) == 0 for the align value. >> --- a/include/linux/kernel.h >> +++ b/include/linux/kernel.h >> @@ -44,6 +44,8 @@ >> #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned >> long)(p), (a))) >> #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == >> 0) >> +#define ALIGN_OF_LAST_BIT(x) ((((x)^((x) - 1))>>1) + 1) > > > Wouldn't ALIGNMENT() be less confusing? After all, that's what this macro is > calculating, right? Alignment of given address. Bits do not have alignment because they aren't directly addressable. Can you hardcode this sequence with comment, because it looks too special for macro. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href