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 16:04:02
Last Modify:2020-03-17 21:26:27 Copyright©Brick
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函数名称：shrink a VMA by removing the specified chunk from either the beginning or* the end

函数原型：static int shrink_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long from, unsigned long to)

返回类型：int

参数：

类型参数名称
struct mm_struct *mm
struct vm_area_struct *vma
unsigned longfrom
unsigned longto
1455  delete a VMA from its owning mm_struct and address space
1456  如果from大于Our start address within vm_mm. 则The first byte after our end addresswithin vm_mm. 等于from
1458  否则Our start address within vm_mm. 等于to
1460  add a VMA into a process's mm_struct in the appropriate place in the list* and tree and add to the address space's page tree also if not an anonymous* page* - should be called with mm->mmap_sem held writelocked
1463  region等于vm_region
1464  BUG_ON(gion usage count (access under nommu_region_sem) != 1)
1466  lock for writing
1467  delete a region from the global tree
1468  如果from大于start address of region 则
1469  to等于gion allocated to here
1470  gion allocated to here 等于gion initialised to here 等于from
1471  否则
1472  start address of region 等于to
1474  add a region into the global tree
1475  lease a write lock
1477  a contiguous series of pages
1478  返回:0
调用者
名称描述
do_munmaplease 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