Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\memory.c Create Date:2022-07-28 14:42:49
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name: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().

Proto:static vm_fault_t __do_fault(struct vm_fault *vmf)

Type:vm_fault_t

Parameter:

TypeParameterName
struct vm_fault *vmf
3234  vma = Target VMA
3252  If pmd_none( * Pointer to pmd entry matching* the 'address' ) && Not Pre-allocated pte page table.* vm_ops->map_pages() calls* alloc_set_pte() from atomic context.* do_fault_around() pre-allocates* page table to avoid allocation from* atomic context. Then
3253  Pre-allocated pte page table.* vm_ops->map_pages() calls* alloc_set_pte() from atomic context.* do_fault_around() pre-allocates* page table to avoid allocation from* atomic context. = pte_alloc_one(The address space we belong to. )
3254  If Not Pre-allocated pte page table.* vm_ops->map_pages() calls* alloc_set_pte() from atomic context.* do_fault_around() pre-allocates* page table to avoid allocation from* atomic context. Then Return VM_FAULT_OOM
3256  smp_wmb()
3259  ret = fault(vmf)
3260  If Value for the false possibility is greater at compile time(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY | VM_FAULT_DONE_COW)) Then Return ret
3264  If Value for the false possibility is greater at compile time(PageHWPoison(->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).)) Then
3265  If ret & VM_FAULT_LOCKED Then 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.
3267  put_page(->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).)
3268  ->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR). = NULL
3269  Return VM_FAULT_HWPOISON
3272  If Value for the false possibility is greater at compile time(!(ret & VM_FAULT_LOCKED)) Then lock_page may only be called if we have the page's inode pinned.
3274  Else VM_BUG_ON_PAGE(!PageLocked(->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).), ->fault handlers should return a* page here, unless VM_FAULT_NOPAGE* is set (which is also implied by* VM_FAULT_ERROR).)
3277  Return ret
Caller
NameDescribe
do_read_fault
do_cow_fault
do_shared_fault