Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:mm\memory.c Create Date:2022-07-28 14:40:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:zap_pte_range

Proto:static unsigned long zap_pte_range(struct mmu_gather *tlb, struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, struct zap_details *details)

Type:unsigned long

Parameter:

TypeParameterName
struct mmu_gather *tlb
struct vm_area_struct *vma
pmd_t *pmd
unsigned longaddr
unsigned longend
struct zap_details *details
1027  mm = mm
1028  force_flush = 0
1035  tlb_change_page_size(tlb, PAGE_SIZE)
1036  again :
1037  init_rss_vec(rss)
1038  start_pte = pte_offset_map_lock(mm, pmd, addr, & ptl)
1039  pte = start_pte
1040  flush_tlb_batched_pending(mm)
1041  A facility to provide lazy MMU batching()
1042  Do
1043  ptent = pte
1044  If pte_none(ptent) Then Continue
1047  If need_resched() Then Break
1050  If pte_present(ptent) Then
1053  page = vm_normal_page -- This function gets the "struct page" associated with a pte.* "Special" mappings do not wish to be associated with a "struct page" (either* it doesn't exist, or it exists but they don't want to touch it). In this
1054  If Value for the false possibility is greater at compile time(details) && page Then
1064  ptent = ptep_get_and_clear_full(mm, addr, pte, we are in the middle of an operation to clear* a full mm and can make some optimizations)
1066  lb_remove_tlb_entry - remember a pte unmapping for later tlb invalidation.* Record the fact that pte's were really unmapped by updating the range,* so we can later optimise away the tlb invalidate. This helps when(tlb, pte, addr)
1067  If Value for the false possibility is greater at compile time(!page) Then Continue
1070  If Not PageAnon(page) Then
1079  rss[mm_counter(page)]--
1080  page_remove_rmap(page, false)
1081  If Value for the false possibility is greater at compile time(page_mapcount(page) < 0) Then This function is called to print an error when a bad pte* is found. For example, we might have a PFN-mapped pte in* a region that doesn't allow it.* The calling function must still handle the error.
1083  If Value for the false possibility is greater at compile time(__tlb_remove_page(tlb, page)) Then
1084  force_flush = 1
1085  addr += PAGE_SIZE
1086  Break
1088  Continue
1091  entry = Convert the arch-dependent pte representation of a swp_entry_t into an* arch-independent swp_entry_t.
1092  If non_swap_entry(entry) && is_device_private_entry(entry) Then
1093  page = device_private_entry_to_page(entry)
1095  If Value for the false possibility is greater at compile time(details && Check page->mapping if set ) Then
1106  Some architectures may be able to avoid expensive synchronization* primitives when modifications are made to PTE's which are already* not present, or in the process of an address space destruction.
1107  rss[mm_counter(page)]--
1108  page_remove_rmap(page, false)
1109  put_page(page)
1110  Continue
1114  If Value for the false possibility is greater at compile time(details) Then Continue
1117  If Not non_swap_entry(entry) Then rss[MM_SWAPENTS]--
1119  Else if is_migration_entry(entry) Then
1122  page = migration_entry_to_page(entry)
1123  rss[mm_counter(page)]--
1125  If Value for the false possibility is greater at compile time(!free_swap_and_cache(entry)) Then This function is called to print an error when a bad pte* is found. For example, we might have a PFN-mapped pte in* a region that doesn't allow it.* The calling function must still handle the error.
1127  Some architectures may be able to avoid expensive synchronization* primitives when modifications are made to PTE's which are already* not present, or in the process of an address space destruction.
1128  When pte++, addr += PAGE_SIZE , addr != end cycle
1130  add_mm_rss_vec(mm, rss)
1131  arch_leave_lazy_mmu_mode()
1134  If force_flush Then tlb_flush_mmu_tlbonly(tlb)
1136  pte_unmap_unlock(start_pte, ptl)
1144  If force_flush Then
1145  force_flush = 0
1146  tlb_flush_mmu(tlb)
1149  If addr != end Then
1150  cond_resched()
1151  Go to again
1154  Return addr
Caller
NameDescribe
zap_pmd_range