diff options
Diffstat (limited to 'arch/arm/include/asm/pgtable-3level.h')
| -rw-r--r-- | arch/arm/include/asm/pgtable-3level.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h index 54733e5ef7a1..4d96a22df51b 100644 --- a/arch/arm/include/asm/pgtable-3level.h +++ b/arch/arm/include/asm/pgtable-3level.h @@ -227,6 +227,7 @@ PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF); #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) +#define pmd_protnone(pmd) (pmd_val(pmd) & PMD_SECT_NONE) /* represent a notpresent pmd by zero, this is used by pmdp_invalidate */ #define pmd_mknotpresent(pmd) (__pmd(0)) @@ -256,6 +257,26 @@ static inline int has_transparent_hugepage(void) return 1; } +#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH +static inline void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address, + pmd_t *pmdp) +{ + pmd_t pmd = pmd_mksplitting(*pmdp); + VM_BUG_ON(address & ~PMD_MASK); + set_pmd_at(vma->vm_mm, address, pmdp, pmd); + + /* + * Hold off until __get_user_pages_fast or arch_block_thp_splitting + * have finished. + * + * The set_pmd_at above finishes with a dsb. This ensures that the + * software splitting bit is observed by the critical section in + * __get_user_pages_fast before we potentially start spinning below. + */ + while (atomic_read(&vma->vm_mm->context.gup_readers) != 0) + cpu_relax(); +} + #endif /* __ASSEMBLY__ */ #endif /* _ASM_PGTABLE_3LEVEL_H */ |