After the commit 19eaf44954df ("mm: thp: support allocation of anonymous
multi-size THP"), it may need to batch update tlb of an address range
through the update_mmu_tlb function. We can simplify this operation by
adding the update_mmu_tlb_range function, which may also reduce the
execution of some unnecessary code in some architectures.
Signed-off-by: Bang Li <libang.li@xxxxxxxxxxxx>
---
include/linux/pgtable.h | 5 +++++
mm/memory.c | 4 +---
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 18019f037bae..73411dfebf7a 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -734,6 +734,11 @@ static inline void update_mmu_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
}
+
+static inline void update_mmu_tlb_range(struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep, unsigned int nr)
+{
+}
#define __HAVE_ARCH_UPDATE_MMU_TLB
#endif
diff --git a/mm/memory.c b/mm/memory.c
index 6647685fd3c4..1f0ca362b82a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4396,7 +4396,6 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
vm_fault_t ret = 0;
int nr_pages = 1;
pte_t entry;
- int i;
/* File mapping without ->vm_ops ? */
if (vma->vm_flags & VM_SHARED)
@@ -4465,8 +4464,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
update_mmu_tlb(vma, addr, vmf->pte);
goto release;
} else if (nr_pages > 1 && !pte_range_none(vmf->pte, nr_pages)) {
- for (i = 0; i < nr_pages; i++)
- update_mmu_tlb(vma, addr + PAGE_SIZE * i, vmf->pte + i);
+ update_mmu_tlb_range(vma, addr, vmf->pte, nr_pages);
goto release;
}
--
2.19.1.6.gb485710b
