diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/page.h | 38 |
1 files changed, 4 insertions, 34 deletions
diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h index b55052ce233..a96b5d986b6 100644 --- a/include/asm-generic/page.h +++ b/include/asm-generic/page.h @@ -4,51 +4,21 @@ #ifdef __KERNEL__ #ifndef __ASSEMBLY__ -#include <linux/log2.h> +#include <linux/compiler.h> -/* - * non-const pure 2^n version of get_order - * - the arch may override these in asm/bitops.h if they can be implemented - * more efficiently than using the arch log2 routines - * - we use the non-const log2() instead if the arch has defined one suitable - */ -#ifndef ARCH_HAS_GET_ORDER -static inline __attribute__((const)) -int __get_order(unsigned long size, int page_shift) +/* Pure 2^n version of get_order */ +static __inline__ __attribute_const__ int get_order(unsigned long size) { -#if BITS_PER_LONG == 32 && defined(ARCH_HAS_ILOG2_U32) - int order = __ilog2_u32(size) - page_shift; - return order >= 0 ? order : 0; -#elif BITS_PER_LONG == 64 && defined(ARCH_HAS_ILOG2_U64) - int order = __ilog2_u64(size) - page_shift; - return order >= 0 ? order : 0; -#else int order; - size = (size - 1) >> (page_shift - 1); + size = (size - 1) >> (PAGE_SHIFT - 1); order = -1; do { size >>= 1; order++; } while (size); return order; -#endif } -#endif - -/** - * get_order - calculate log2(pages) to hold a block of the specified size - * @n - size - * - * calculate allocation order based on the current page size - * - this can be used to initialise global variables from constant data - */ -#define get_order(n) \ -( \ - __builtin_constant_p(n) ? \ - ((n < (1UL << PAGE_SHIFT)) ? 0 : ilog2(n) - PAGE_SHIFT) : \ - __get_order(n, PAGE_SHIFT) \ - ) #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ |