函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\mmap.c Create Date:2022-07-27 16:15:30
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：count_vma_pages_range

函数原型：static unsigned long count_vma_pages_range(struct mm_struct *mm, unsigned long addr, unsigned long end)

返回类型：unsigned long

参数：

类型参数名称
struct mm_struct *mm
unsigned longaddr
unsigned longend
563  nr_pages等于0
567  vma等于Look up the first VMA which intersects the interval start_addr..end_addr-1,NULL if none. Assume start_addr < end_addr.
568  如果非vma则返回:0
571  nr_pages等于两数取小(end, The first byte after our end addresswithin vm_mm. )减两数取大(addr, Our start address within vm_mm. )右移PAGE_SHIFT determines the page size 位
575  以vma循环
578  如果Our start address within vm_mm. 大于end则退出
581  overlap_len等于两数取小(end, The first byte after our end addresswithin vm_mm. )减Our start address within vm_mm.
582  nr_pages加等于overlap_len右移PAGE_SHIFT determines the page size 位
585  返回:nr_pages
调用者
名称描述
mmap_region