copy_pmd_range

函数名称：copy_pmd_range

函数原型：static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, pud_t *dst_pud, pud_t *src_pud, struct vm_area_struct *vma, unsigned long addr, unsigned long end)

返回类型：int

参数：

类型	参数	名称
struct mm_struct *	dst_mm
struct mm_struct *	src_mm
pud_t *	dst_pud
pud_t *	src_pud
struct vm_area_struct *	vma
unsigned long	addr
unsigned long	end

872

dst_pmd等于pmd_alloc(dst_mm, dst_pud, addr)

873

如果非dst_pmd则返回:负ENOMEM

875

src_pmd等于pmd_offset(src_pud, addr)

876

循环

877

next等于pmd_addr_end(addr, end)

878

如果is_swap_pmd( * src_pmd)或pmd_trans_huge( * src_pmd)或pmd_devmap( * src_pmd)则

881

VM_BUG_ON_VMA(next - addr != HPAGE_PMD_SIZE, vma)

882

err等于copy_huge_pmd(dst_mm, src_mm, dst_pmd, src_pmd, addr, vma)

884

如果err恒等于负ENOMEM则返回:负ENOMEM

886

如果非err则继续下一循环

890

如果pmd_none_or_clear_bad(src_pmd)则继续下一循环

892

如果copy_pte_range(dst_mm, src_mm, dst_pmd, src_pmd, vma, addr, next)则返回:负ENOMEM

895

当dst_pmd自加, src_pmd自加, addr等于next, addr不等于end 循环

896

返回:0

**调用者**
名称	描述
copy_pud_range

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