https://github.com/torvalds/linux
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Tip revision: c6a389f123b9f68d605bb7e0f9b32ec1e3e14132 authored by Linus Torvalds on 29 August 2011, 04:16:01 UTC
Linux 3.1-rc4
Tip revision: c6a389f
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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