Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef __ASM_GENERIC_GETORDER_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define __ASM_GENERIC_GETORDER_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #ifndef __ASSEMBLY__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/log2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * get_order - Determine the allocation order of a memory size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * @size: The size for which to get the order
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  * Determine the allocation order of a particular sized block of memory.  This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * is on a logarithmic scale, where:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *	0 -> 2^0 * PAGE_SIZE and below
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *	1 -> 2^1 * PAGE_SIZE to 2^0 * PAGE_SIZE + 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  *	2 -> 2^2 * PAGE_SIZE to 2^1 * PAGE_SIZE + 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  *	3 -> 2^3 * PAGE_SIZE to 2^2 * PAGE_SIZE + 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  *	4 -> 2^4 * PAGE_SIZE to 2^3 * PAGE_SIZE + 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  *	...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * The order returned is used to find the smallest allocation granule required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  * to hold an object of the specified size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  * The result is undefined if the size is 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static inline __attribute_const__ int get_order(unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	if (__builtin_constant_p(size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		if (!size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 			return BITS_PER_LONG - PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		if (size < (1UL << PAGE_SHIFT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		return ilog2((size) - 1) - PAGE_SHIFT + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	size--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	size >>= PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #if BITS_PER_LONG == 32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	return fls(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	return fls64(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #endif	/* __ASSEMBLY__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #endif	/* __ASM_GENERIC_GETORDER_H */