函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\nommu.c Create Date:2022-07-27 16:04:08
Last Modify:2020-03-17 21:26:27 Copyright©Brick
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函数名称：lease a mapping* - under NOMMU conditions the chunk to be unmapped must be backed by a single* VMA, though it need not cover the whole VMA

函数原型：int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, struct list_head *uf)

返回类型：int

参数：

类型参数名称
struct mm_struct *mm
unsigned longstart
size_tlen
struct list_head *uf
1492  len等于 align the pointer to the (next) page boundary (len)
1493  如果len恒等于0则返回:负EINVAL
1496  end等于start加len
1499  vma等于Look up the first VMA which satisfies addr < vm_end, NULL if none.
1500  如果非vma则
1502  如果limit小于5则
1503  打印警告信息("munmap of memory not mmapped by process %d (%s): 0x%lx-0x%lx\n", pid, comm, start, start + len - 1)
1506  limit自加
1508  返回:负EINVAL
1512  如果File we map to (can be NULL). 则
1513  循环
1514  如果start大于Our start address within vm_mm. 则返回:负EINVAL
1516  如果end恒等于The first byte after our end addresswithin vm_mm. 则转到:erase_whole_vma
1518  vma等于linked list of VM areas per task, sorted by address
1519  当vma循环
1520  返回:负EINVAL
1521  否则
1523  如果start恒等于Our start address within vm_mm. 且end恒等于The first byte after our end addresswithin vm_mm. 则转到:erase_whole_vma
1525  如果start小于Our start address within vm_mm. 或end大于The first byte after our end addresswithin vm_mm. 则返回:负EINVAL
1527  如果offset_in_page(start)则返回:负EINVAL
1529  如果end不等于The first byte after our end addresswithin vm_mm. 且offset_in_page(end)则返回:负EINVAL
1531  如果start不等于Our start address within vm_mm. 且end不等于The first byte after our end addresswithin vm_mm. 则
1532  ret等于split a vma into two pieces at address 'addr', a new vma is allocated either* for the first part or the tail.
1533  如果ret小于0则返回:ret
1536  返回:shrink a VMA by removing the specified chunk from either the beginning or* the end
1539  erase_whole_vma :
1540  delete a VMA from its owning mm_struct and address space
1541  destroy a VMA record
1542  返回:0
调用者
名称描述
vm_munmap
ksys_shmdtdetach and kill segment if marked destroyed.* The work is done in shm_close.