函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\linux\mm.h Create Date:2022-07-27 06:44:50
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：vma_adjust

函数原型：static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start, unsigned long end, unsigned long pgoff, struct vm_area_struct *insert)

返回类型：int

参数：

类型参数名称
struct vm_area_struct *vma
unsigned longstart
unsigned longend
unsigned longpgoff
struct vm_area_struct *insert
2261  返回:We cannot adjust vm_start, vm_end, vm_pgoff fields of a vma that* is already present in an i_mmap tree without adjusting the tree.* The following helper function should be used when such adjustments* are necessary
调用者
名称描述
__split_vma__split_vma() bypasses sysctl_max_map_count checking. We use this where it* has already been checked or doesn't make sense to fail.
SYSCALL_DEFINE5Expand (or shrink) an existing mapping, potentially moving it at the* same time (controlled by the MREMAP_MAYMOVE flag and available VM space)* MREMAP_FIXED option added 5-Dec-1999 by Benjamin LaHaise* This option implies MREMAP_MAYMOVE.
shift_arg_pagesDuring bprm_mm_init(), we create a temporary stack at STACK_TOP_MAX. Once* the binfmt code determines where the new stack should reside, we shift it to* its final location. The process proceeds as follows:* 1) Use shift to calculate the new vma endpoints.