#ifndef __ASM_GENERIC_GETORDER_H#define __ASM_GENERIC_GETORDER_H #ifndef __ASSEMBLY__ #include <linux/compiler.h>#include <linux/log2.h> /* * Runtime evaluation of get_order() */static inline __attribute_const__int __get_order(unsigned long size){	int order; 	size--;	size >>= PAGE_SHIFT;#if BITS_PER_LONG == 32	order = fls(size);#else	order = fls64(size);#endif	return order;} /** * get_order - Determine the allocation order of a memory size * @size: The size for which to get the order * * Determine the allocation order of a particular sized block of memory.  This * is on a logarithmic scale, where: * *	0 -> 2^0 * PAGE_SIZE and below *	1 -> 2^1 * PAGE_SIZE to 2^0 * PAGE_SIZE + 1 *	2 -> 2^2 * PAGE_SIZE to 2^1 * PAGE_SIZE + 1 *	3 -> 2^3 * PAGE_SIZE to 2^2 * PAGE_SIZE + 1 *	4 -> 2^4 * PAGE_SIZE to 2^3 * PAGE_SIZE + 1 *	... * * The order returned is used to find the smallest allocation granule required * to hold an object of the specified size. * * The result is undefined if the size is 0. * * This function may be used to initialise variables with compile time * evaluations of constants. */#define get_order(n)						\(								\	__builtin_constant_p(n) ? (				\		((n) == 0UL) ? BITS_PER_LONG - PAGE_SHIFT :	\		(((n) < (1UL << PAGE_SHIFT)) ? 0 :		\		 ilog2((n) - 1) - PAGE_SHIFT + 1)		\	) :							\	__get_order(n)						\) #endif	/* __ASSEMBLY__ */ #endif	/* __ASM_GENERIC_GETORDER_H */