Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "Restore TLB invalidation for the 'break-before-make' rule on
  contiguous ptes (missed in a recent clean-up)"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: hugetlb: Restore TLB invalidation for BBM on contiguous ptes

Author: torvalds

arch/arm64/mm/hugetlbpage.c

@@ -214,6 +214,19 @@ static pte_t get_clear_contig(struct mm_struct *mm,
 	return orig_pte;
 }
 
+static pte_t get_clear_contig_flush(struct mm_struct *mm,
+				    unsigned long addr,
+				    pte_t *ptep,
+				    unsigned long pgsize,
+				    unsigned long ncontig)
+{
+	pte_t orig_pte = get_clear_contig(mm, addr, ptep, pgsize, ncontig);
+	struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
+
+	flush_tlb_range(&vma, addr, addr + (pgsize * ncontig));
+	return orig_pte;
+}
+
 /*
  * Changing some bits of contiguous entries requires us to follow a
  * Break-Before-Make approach, breaking the whole contiguous set
@@ -447,19 +460,20 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 	int ncontig, i;
 	size_t pgsize = 0;
 	unsigned long pfn = pte_pfn(pte), dpfn;
+	struct mm_struct *mm = vma->vm_mm;
 	pgprot_t hugeprot;
 	pte_t orig_pte;
 
 	if (!pte_cont(pte))
 		return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
 
-	ncontig = find_num_contig(vma->vm_mm, addr, ptep, &pgsize);
+	ncontig = find_num_contig(mm, addr, ptep, &pgsize);
 	dpfn = pgsize >> PAGE_SHIFT;
 
 	if (!__cont_access_flags_changed(ptep, pte, ncontig))
 		return 0;
 
-	orig_pte = get_clear_contig(vma->vm_mm, addr, ptep, pgsize, ncontig);
+	orig_pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
 
 	/* Make sure we don't lose the dirty or young state */
 	if (pte_dirty(orig_pte))
@@ -470,7 +484,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
 
 	hugeprot = pte_pgprot(pte);
 	for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
-		set_pte_at(vma->vm_mm, addr, ptep, pfn_pte(pfn, hugeprot));
+		set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
 
 	return 1;
 }
@@ -492,7 +506,7 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
 	ncontig = find_num_contig(mm, addr, ptep, &pgsize);
 	dpfn = pgsize >> PAGE_SHIFT;
 
-	pte = get_clear_contig(mm, addr, ptep, pgsize, ncontig);
+	pte = get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
 	pte = pte_wrprotect(pte);
 
 	hugeprot = pte_pgprot(pte);
@@ -505,17 +519,15 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
 pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
 			    unsigned long addr, pte_t *ptep)
 {
+	struct mm_struct *mm = vma->vm_mm;
 	size_t pgsize;
 	int ncontig;
-	pte_t orig_pte;
 
 	if (!pte_cont(READ_ONCE(*ptep)))
 		return ptep_clear_flush(vma, addr, ptep);
 
-	ncontig = find_num_contig(vma->vm_mm, addr, ptep, &pgsize);
-	orig_pte = get_clear_contig(vma->vm_mm, addr, ptep, pgsize, ncontig);
-	flush_tlb_range(vma, addr, addr + pgsize * ncontig);
-	return orig_pte;
+	ncontig = find_num_contig(mm, addr, ptep, &pgsize);
+	return get_clear_contig_flush(mm, addr, ptep, pgsize, ncontig);
 }
 
 static int __init hugetlbpage_init(void)