From: "Aneesh Kumar K.V" <[email protected]> It's required to avoid loosing dirty and accessed bits.
Signed-off-by: Aneesh Kumar K.V <[email protected]> Signed-off-by: Kirill A. Shutemov <[email protected]> --- arch/powerpc/include/asm/book3s/64/pgtable.h | 4 ++-- arch/powerpc/mm/pgtable-book3s64.c | 7 +++++-- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index b9aff515b4de..aca7cfa349eb 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -1137,8 +1137,8 @@ static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, } #define __HAVE_ARCH_PMDP_INVALIDATE -extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, - pmd_t *pmdp); +extern pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, + pmd_t *pmdp); #define __HAVE_ARCH_PMDP_HUGE_SPLIT_PREPARE static inline void pmdp_huge_split_prepare(struct vm_area_struct *vma, diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c index 3b65917785a5..422e80253a33 100644 --- a/arch/powerpc/mm/pgtable-book3s64.c +++ b/arch/powerpc/mm/pgtable-book3s64.c @@ -90,16 +90,19 @@ void serialize_against_pte_lookup(struct mm_struct *mm) * We use this to invalidate a pmdp entry before switching from a * hugepte to regular pmd entry. */ -void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, +pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) { - pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0); + unsigned long old_pmd; + + old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0); flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); /* * This ensures that generic code that rely on IRQ disabling * to prevent a parallel THP split work as expected. */ serialize_against_pte_lookup(vma->vm_mm); + return __pmd(old_pmd); } static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot) -- 2.14.1
