linux-master/mm/mmap.c

212 	 * segment grow beyond its set limit the in case where the limit is
1972  * grow-up and grow-down cases.
1975 			     unsigned long size, unsigned long grow)
1981 	if (!may_expand_vm(mm, vma->vm_flags, grow))
1989 	if (!mlock_future_ok(mm, vma->vm_flags, grow << PAGE_SHIFT))
1992 	/* Check to ensure the stack will not grow into a hugetlb-only region */
2002 	if (security_vm_enough_memory_mm(mm, grow))
2068 		unsigned long size, grow;
2071 		grow = (address - vma->vm_end) >> PAGE_SHIFT;
2075 			error = acct_stack_growth(vma, size, grow);
2088 					mm->locked_vm += grow;
2089 				vm_stat_account(mm, vma->vm_flags, grow);
2160 		unsigned long size, grow;
2163 		grow = (vma->vm_start - address) >> PAGE_SHIFT;
2166 		if (grow <= vma->vm_pgoff) {
2167 			error = acct_stack_growth(vma, size, grow);
2180 					mm->locked_vm += grow;
2181 				vm_stat_account(mm, vma->vm_flags, grow);
2184 				vma->vm_pgoff -= grow;