函数逻辑报告

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v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\vmalloc.c Create Date:2022-07-27 16:28:31
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Returns a start address of the newly allocated area, if success.* Otherwise a vend is returned that indicates failure.

函数原型：static __always_inline unsigned long __alloc_vmap_area(unsigned long size, unsigned long align, unsigned long vstart, unsigned long vend)

返回类型：unsigned long

参数：

类型参数名称
unsigned longsize
unsigned longalign
unsigned longvstart
unsigned longvend
1034  va等于Find the first free block(lowest start address) in the tree,* that will accomplish the request corresponding to passing* parameters.
1035  如果此条件成立可能性小(为编译器优化)(!va)则返回:vend
1038  如果va_start大于vstart则nva_start_addr等于@a is a power of 2 value (va_start, align)
1040  否则nva_start_addr等于@a is a power of 2 value (vstart, align)
1044  如果nva_start_addr加size大于vend则返回:vend
1048  type等于classify_va_fit_type(va, nva_start_addr, size)
1049  如果WARN_ON_ONCE(type == NOTHING_FIT)则返回:vend
1053  ret等于adjust_va_to_fit_type(va, nva_start_addr, size, type)
1054  如果ret则返回:vend
1061  返回:nva_start_addr
调用者
名称描述
alloc_vmap_areaAllocate a region of KVA of the specified size and alignment, within the* vstart and vend.