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v0.5.1
https://github.com/torvalds/linux
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Tip revision: fe0d42203cb5616eeff68b14576a0f7e2dd56625 authored by Linus Torvalds on 04 July 2011, 22:56:24 UTC
Linux 3.0-rc6
Tip revision: fe0d422
getorder.h
#ifndef __ASM_GENERIC_GETORDER_H
#define __ASM_GENERIC_GETORDER_H

#ifndef __ASSEMBLY__

#include <linux/compiler.h>

/* Pure 2^n version of get_order */
static inline __attribute_const__ int get_order(unsigned long size)
{
	int order;

	size = (size - 1) >> (PAGE_SHIFT - 1);
	order = -1;
	do {
		size >>= 1;
		order++;
	} while (size);
	return order;
}

#endif	/* __ASSEMBLY__ */

#endif	/* __ASM_GENERIC_GETORDER_H */
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