Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCHv3 01/11] asm-generic: Provide generic_pmdp_establish() | Date | Tue, 12 Sep 2017 18:39:31 +0300 |
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This is implementation of pmdp_establish() that is only suitable for an architecture that doesn't have hardware dirty/accessed bits. In this case we can't race with CPU which sets these bits and non-atomic approach is fine.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- include/asm-generic/pgtable.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 8e0243036564..bf0889eb774d 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -308,6 +308,21 @@ extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); #endif +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +/* + * This is implementation of pmdp_establish() that is only suitable for an + * architecture that doesn't have hardware dirty/accessed bits. In this case we + * can't race with CPU which sets these bits and non-atomic aproach is fine. + */ +static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp, pmd_t pmd) +{ + pmd_t old_pmd = *pmdp; + set_pmd_at(vma->vm_mm, address, pmdp, pmd); + return old_pmd; +} +#endif + #ifndef __HAVE_ARCH_PMDP_INVALIDATE extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp); -- 2.14.1
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