#define BITS_TO_LONG(bits) \
(((bits)+BITS_PER_LONG-1)/BITS_PER_LONG)
this IMO simplifies some of the initializers, eg. the all-1 cpu-mask:
#define CPU_MASK_ALL \
{ [0 ... BITS_TO_LONG(NR_CPUS)-1] = ~0UL }
Ingo
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