Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\gup.c Create Date:2022-07-28 14:35:36
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:We can leverage the VM_FAULT_RETRY functionality in the page fault* paths better by using either get_user_pages_locked() or* get_user_pages_unlocked().* get_user_pages_locked() is suitable to replace the form:* down_read(&mm->mmap_sem);* do_something()

Proto:long get_user_pages_locked(unsigned long start, unsigned long nr_pages, unsigned int gup_flags, struct page **pages, int *locked)

Type:long

Parameter:

TypeParameterName
unsigned longstart
unsigned longnr_pages
unsigned intgup_flags
struct page **pages
int *locked
1661  If WARN_ON_ONCE(gup_flags & mapping lifetime is indefinite: see below ) Then Return -EINVAL
1664  Return __get_user_pages_locked(current process, mm, start, nr_pages, pages, NULL, locked, gup_flags | mark page accessed )
Caller
NameDescribe
lookup_node
get_vaddr_framesget_vaddr_frames() - map virtual addresses to pfns*@start: starting user address*@nr_frames: number of pages / pfns from start to map*@gup_flags: flags modifying lookup behaviour*@vec: structure which receives pages / pfns of the addresses mapped.