mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 06:55:13 +08:00
fd4fd5aac1
Someone mentioned that almost all the architectures used basically the same implementation of get_order. This patch consolidates them into asm-generic/page.h and includes that in the appropriate places. The exceptions are ia64 and ppc which have their own (presumably optimised) versions. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
27 lines
452 B
C
27 lines
452 B
C
#ifndef _ASM_GENERIC_PAGE_H
|
|
#define _ASM_GENERIC_PAGE_H
|
|
|
|
#ifdef __KERNEL__
|
|
#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 /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_GENERIC_PAGE_H */
|