vm_start

函数名称：vm_start_gap

函数原型：static inline unsigned long vm_start_gap(struct vm_area_struct *vma)

返回类型：unsigned long

参数：

类型	参数	名称
struct vm_area_struct *	vma

**调用者**
名称	描述
arch_get_unmapped_area
arch_get_unmapped_area_topdown
SYSCALL_DEFINE1
vma_compute_gap
unmapped_area
unmapped_area_topdown
arch_get_unmapped_area	Get an address range which is currently unmapped.* For shmat() with addr=0.* Ugly calling convention alert:* Return value with the low bits set means error value,* ie* if (ret & ~PAGE_MASK)* error = ret;
arch_get_unmapped_area_topdown	This mmap-allocator allocates new areas top-down from below the* stack's low limit (the base):

函数逻辑报告