Commit 46dcde73 authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Linus Torvalds

thp: introduce pmdp_invalidate()

On s390, a valid page table entry must not be changed while it is attached
to any CPU.  So instead of pmd_mknotpresent() and set_pmd_at(), an IDTE
operation would be necessary there.  This patch introduces the
pmdp_invalidate() function, to allow architecture-specific
Signed-off-by: default avatarGerald Schaefer <>
Cc: Andrea Arcangeli <>
Cc: Andi Kleen <>
Cc: Hugh Dickins <>
Cc: Hillf Danton <>
Cc: Martin Schwidefsky <>
Cc: Heiko Carstens <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent e3ebcf64
......@@ -170,6 +170,11 @@ extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable);
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);
extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp);
static inline int pte_same(pte_t pte_a, pte_t pte_b)
......@@ -1361,8 +1361,7 @@ static int __split_huge_page_map(struct page *page,
* SMP TLB and finally we write the non-huge version
* of the pmd entry with pmd_populate.
set_pmd_at(mm, address, pmd, pmd_mknotpresent(*pmd));
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
pmdp_invalidate(vma, address, pmd);
pmd_populate(mm, pmd, pgtable);
ret = 1;
......@@ -159,3 +159,14 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm)
void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(*pmdp));
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
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