vmalloc_to_page

Name:Walk a vmap address to the struct page it maps.

Proto:struct page *vmalloc_to_page(const void *vmalloc_addr)

Type:struct page

Parameter:

Type	Parameter	Name
const void *	vmalloc_addr

271

addr = vmalloc_addr

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struct page * page = NULL

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pgd = a shortcut which implies the use of the kernel's pgd, instead* of a process's(addr)

283

VIRTUAL_BUG_ON(!is_vmalloc_or_module_addr(vmalloc_addr))

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If The "pgd_xxx()" functions here are trivial for a folded two-level* setup: the p4d is never bad, and a p4d always exists (as it's folded* into the pgd entry) Then Return NULL

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p4d = p4d_offset(pgd, addr)

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If The "p4d_xxx()" functions here are trivial for a folded two-level* setup: the pud is never bad, and a pud always exists (as it's folded* into the p4d entry) Then Return NULL

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pud = pud_offset(p4d, addr)

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WARN_ON_ONCE(pud_bad( * pud))

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If The "pud_xxx()" functions here are trivial for a folded two-level* setup: the pmd is never bad, and a pmd always exists (as it's folded* into the pud entry) || pud_bad( * pud) Then Return NULL

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pmd = pmd_offset(pud, addr)

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WARN_ON_ONCE(pmd_bad( * pmd))

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If pmd_none( * pmd) || pmd_bad( * pmd) Then Return NULL

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ptep = pte_offset_map(pmd, addr)

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pte = ptep

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If pte_present(pte) Then page = pte_page(pte)

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pte_unmap(ptep)

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Return page

**Caller**
Name	Describe
__text_poke
relay_buf_fault	ault() vm_op implementation for relay file mapping.
vmalloc_to_pfn	Map a vmalloc()-space virtual address to the physical page frame number.
aligned_vread	small helper routine , copy contents to buf from addr.* If the page is not present, fill zero.
aligned_vwrite
remap_vmalloc_range_partial	map_vmalloc_range_partial - map vmalloc pages to userspace@vma: vma to cover@uaddr: target user address to start at@kaddr: virtual address of vmalloc kernel memory@size: size of map area* Returns: 0 for success, -Exxx on failure* This function checks
swp_swapcount	How many references to @entry are currently swapped out?* This considers COUNT_CONTINUED so it returns exact answer.
add_swap_count_continuation	add_swap_count_continuation - called when a swap count is duplicated* beyond SWAP_MAP_MAX, it allocates a new page and links that to the entry's* page of the original vmalloc'ed swap_map, to hold the continuation count
swap_count_continued	swap_count_continued - when the original swap_map count is incremented* from SWAP_MAP_MAX, check if there is already a continuation page to carry* into, carry if so, or else fail until a new continuation page is allocated;* when the original swap_map
free_swap_count_continuations	_swap_count_continuations - swapoff free all the continuation pages* appended to the swap_map, after swap_map is quiesced, before vfree'ing it.

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