change_pte

Name:change_pte_range

Proto:static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, unsigned long addr, unsigned long end, pgprot_t newprot, int dirty_accountable, int prot_numa)

Type:unsigned long

Parameter:

Type	Parameter	Name
struct vm_area_struct *	vma
pmd_t *	pmd
unsigned long	addr
unsigned long	end
pgprot_t	newprot
int	dirty_accountable
int	prot_numa

pages = 0

target_node = NUMA_NO_NODE

If This is a noop if Transparent Hugepage Support is not built into* the kernel Then Return 0

pte = pte_offset_map_lock(The address space we belong to. , pmd, addr, & ptl)

If prot_numa && Not (Flags, see mm.h. & VM_SHARED) && atomic_read( & mm_users) == 1 Then target_node = Returns the number of the current Node.

flush_tlb_batched_pending(The address space we belong to. )

A facility to provide lazy MMU batching()

oldpte = pte

If pte_present(oldpte) Then

preserve_write = prot_numa && pte_write(oldpte)

If prot_numa Then

If Technically a PTE can be PROTNONE even when not doing NUMA balancing but* the only case the kernel cares is for NUMA balancing and is only ever set* when the VMA is accessible. For PROT_NONE VMAs, the PTEs are not marked Then Continue

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

If Not page || A KSM page is one of those write-protected "shared pages" or "merged pages"* which KSM maps into multiple mms, wherever identical anonymous page content* is found in VM_MERGEABLE vmas. It's a PageAnon page, pointing not to any Then Continue

If is_cow_mapping(Flags, see mm.h. ) && page_mapcount(page) != 1 Then Continue

101

If page_is_file_cache - should the page be on a file LRU or anon LRU?*@page: the page to test* Returns 1 if @page is page cache page backed by a regular filesystem,* or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed && PageDirty(page) Then Continue

108

If target_node == page_to_nid(page) Then Continue

112

oldpte = Start a pte protection read-modify-write transaction, which* protects against asynchronous hardware modifications to the pte

113

ptent = pte_modify(oldpte, newprot)

114

If preserve_write Then ptent = pte_mk_savedwrite(ptent)

118

If dirty_accountable && The following only work if pte_present() is true.* Undefined behaviour if not.. && (pte_soft_dirty(ptent) || Not (Flags, see mm.h. & VM_SOFTDIRTY) ) Then

121

ptent = pte_mkwrite(ptent)

123

Commit an update to a pte, leaving any hardware-controlled bits in* the PTE unmodified.

124

pages++

125

Else if IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',* 0 otherwise.(CONFIG_MIGRATION) Then

126

entry = Convert the arch-dependent pte representation of a swp_entry_t into an* arch-independent swp_entry_t.

128

If is_write_migration_entry(entry) Then

134

make_migration_entry_read( & entry)

135

newpte = Convert the arch-independent representation of a swp_entry_t into the* arch-dependent pte representation.

136

If pte_swp_soft_dirty(oldpte) Then newpte = pte_swp_mksoft_dirty(newpte)

138

set_pte_at(The address space we belong to. , addr, pte, newpte)

140

pages++

143

If is_write_device_private_entry(entry) Then

150

make_device_private_entry_read( & entry)

151

newpte = Convert the arch-independent representation of a swp_entry_t into the* arch-dependent pte representation.

152

set_pte_at(The address space we belong to. , addr, pte, newpte)

154

pages++

157

When pte++, addr += PAGE_SIZE , addr != end cycle

158

arch_leave_lazy_mmu_mode()

159

pte_unmap_unlock(pte - 1, ptl)

161

Return pages

**Caller**
Name	Describe
change_pmd_range

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