函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\memory.c Create Date:2022-07-27 16:10:21
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：do_read_fault

函数原型：static vm_fault_t do_read_fault(struct vm_fault *vmf)

返回类型：vm_fault_t

参数：

类型参数名称
struct vm_fault *vmf
3642  vma等于Target VMA
3643  ret等于0
3650  如果map_pages且fault_around_bytes右移PAGE_SHIFT determines the page size 位大于1则
3651  ret等于do_fault_around() tries to map few pages around the fault address. The hope* is that the pages will be needed soon and this will lower the number of* faults to handle.* It uses vm_ops->map_pages() to map the pages, which skips the page if it's
3652  如果ret则返回:ret
3656  ret等于The mmap_sem must have been held on entry, and may have been* released depending on flags and vma->vm_ops->fault() return value.* See filemap_fault() and __lock_page_retry().
3657  如果此条件成立可能性小(为编译器优化)(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))则返回:ret
3660  ret或等于sh_fault - finish page fault once we have prepared the page to fault*@vmf: structure describing the fault* This function handles all that is needed to finish a page fault once the* page to fault in is prepared
3661  lock_page - unlock a locked page*@page: the page* Unlocks the page and wakes up sleepers in ___wait_on_page_locked().* Also wakes sleepers in wait_on_page_writeback() because the wakeup* mechanism between PageLocked pages and PageWriteback pages is shared.
3662  如果此条件成立可能性小(为编译器优化)(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))则put_page(->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).)
3664  返回:ret
调用者
名称描述
do_faultWe enter with non-exclusive mmap_sem (to exclude vma changes,* but allow concurrent faults)