Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* lib/bitmap.c pulls in at least two other files. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/bitmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) void bitmap_clear(unsigned long *map, unsigned int start, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 	unsigned long *p = map + BIT_WORD(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 	const unsigned int size = start + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 	int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 	unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	while (len - bits_to_clear >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 		*p &= ~mask_to_clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 		len -= bits_to_clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 		bits_to_clear = BITS_PER_LONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 		mask_to_clear = ~0UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 		mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		*p &= ~mask_to_clear;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }