hugetlb_change_protection

函数名称：hugetlb_change_protection

函数原型：unsigned long hugetlb_change_protection(struct vm_area_struct *vma, unsigned long address, unsigned long end, pgprot_t newprot)

返回类型：unsigned long

参数：

类型	参数	名称
struct vm_area_struct *	vma
unsigned long	address
unsigned long	end
pgprot_t	newprot

4475

ptep等于huge_pte_offset(mm, address, huge_page_size(h))

4476

如果非ptep则继续下一循环

4478

ptl等于huge_pte_lock(h, mm, ptep)

4479

如果huge_pmd_unshare(mm, & address, ptep)则

4480

pages自加

4481

自旋锁解锁

4482

shared_pmd = true

4483

继续下一循环

4485

pte等于huge_ptep_get(ptep)

4486

如果此条件成立可能性小(为编译器优化)(is_hugetlb_entry_hwpoisoned(pte))则

4487

自旋锁解锁

4488

继续下一循环

4490

如果此条件成立可能性小(为编译器优化)(is_hugetlb_entry_migration(pte))则

4491

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

4493

如果is_write_migration_entry(entry)则

4496

make_migration_entry_read( & entry)

4497

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

4498

set_huge_swap_pte_at(mm, address, ptep, newpte, huge_page_size(h))

4500

pages自加

4502

自旋锁解锁

4503

继续下一循环

4505

如果非huge_pte_none(pte)则

4508

old_pte等于huge_ptep_modify_prot_start(vma, address, ptep)

4509

pte等于pte_mkhuge(huge_pte_modify(old_pte, newprot))

4510

pte等于arch_make_huge_pte(pte, vma, NULL, 0)

4511

huge_ptep_modify_prot_commit(vma, address, ptep, old_pte, pte)

4512

pages自加

4514

自旋锁解锁

函数逻辑报告