highest_address   391 mm/mmap.c      	unsigned long highest_address = 0;
highest_address   405 mm/mmap.c      		highest_address = vm_end_gap(vma);
highest_address   413 mm/mmap.c      	if (highest_address != mm->highest_vm_end) {
highest_address   415 mm/mmap.c      			  mm->highest_vm_end, highest_address);