void bitmap_set_atomic(unsigned long *map, long start, long nr) { unsigned long *p = map + BIT_WORD(start); const long size = start + nr; int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG); unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start); /* First word */ if (nr - bits_to_set > 0) { atomic_or(p, mask_to_set); nr -= bits_to_set; bits_to_set = BITS_PER_LONG; mask_to_set = ~0UL; p++; } /* Full words */ if (bits_to_set == BITS_PER_LONG) { while (nr >= BITS_PER_LONG) { *p = ~0UL; nr -= BITS_PER_LONG; p++; } } /* Last word */ if (nr) { mask_to_set &= BITMAP_LAST_WORD_MASK(size); atomic_or(p, mask_to_set); } else { /* If we avoided the full barrier in atomic_or(), issue a * barrier to account for the assignments in the while loop. */ smp_mb(); } }