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Tip revision: 33688abb2802ff3a230bd2441f765477b94cc89e authored by Linus Torvalds on 20 June 2016, 04:30:02 UTC
Linux 4.7-rc4
Linux 4.7-rc4
Tip revision: 33688ab
getorder.h
#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 */