mm: introduce wrappers to access mm->nr_ptes

Let's add wrappers for ->nr_ptes with the same interface as for nr_pmd
and nr_pud.

The patch also makes nr_ptes accounting dependent onto CONFIG_MMU.  Page
table accounting doesn't make sense if you don't have page tables.

It's preparation for consolidation of page-table counters in mm_struct.

Link: http://lkml.kernel.org/r/20171006100651.44742-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 13 insertions, 14 deletions

diff --git a/mm/debug.c b/mm/debug.c
index a12d826b..c9888a6 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -136,7 +136,7 @@ void dump_mm(const struct mm_struct *mm)
 		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 		mm->pgd, atomic_read(&mm->mm_users),
 		atomic_read(&mm->mm_count),
-		atomic_long_read((atomic_long_t *)&mm->nr_ptes),
+		mm_nr_ptes(mm),
 		mm_nr_pmds(mm),
 		mm_nr_puds(mm),
 		mm->map_count,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index cc65fb8..3610d81 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -606,7 +606,7 @@ static int __do_huge_pmd_anonymous_page(struct vm_fault *vmf, struct page *page,
 		pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable);
 		set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
 		add_mm_counter(vma->vm_mm, MM_ANONPAGES, HPAGE_PMD_NR);
-		atomic_long_inc(&vma->vm_mm->nr_ptes);
+		mm_inc_nr_ptes(vma->vm_mm);
 		spin_unlock(vmf->ptl);
 		count_vm_event(THP_FAULT_ALLOC);
 	}
@@ -662,7 +662,7 @@ static bool set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm,
 	if (pgtable)
 		pgtable_trans_huge_deposit(mm, pmd, pgtable);
 	set_pmd_at(mm, haddr, pmd, entry);
-	atomic_long_inc(&mm->nr_ptes);
+	mm_inc_nr_ptes(mm);
 	return true;
 }
 
@@ -747,7 +747,7 @@ static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
 
 	if (pgtable) {
 		pgtable_trans_huge_deposit(mm, pmd, pgtable);
-		atomic_long_inc(&mm->nr_ptes);
+		mm_inc_nr_ptes(mm);
 	}
 
 	set_pmd_at(mm, addr, pmd, entry);
@@ -978,7 +978,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 	get_page(src_page);
 	page_dup_rmap(src_page, true);
 	add_mm_counter(dst_mm, MM_ANONPAGES, HPAGE_PMD_NR);
-	atomic_long_inc(&dst_mm->nr_ptes);
+	mm_inc_nr_ptes(dst_mm);
 	pgtable_trans_huge_deposit(dst_mm, dst_pmd, pgtable);
 
 	pmdp_set_wrprotect(src_mm, addr, src_pmd);
@@ -1695,7 +1695,7 @@ static inline void zap_deposited_table(struct mm_struct *mm, pmd_t *pmd)
 
 	pgtable = pgtable_trans_huge_withdraw(mm, pmd);
 	pte_free(mm, pgtable);
-	atomic_long_dec(&mm->nr_ptes);
+	mm_dec_nr_ptes(mm);
 }
 
 int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 43cb304..ea4ff25 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1270,7 +1270,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
 			_pmd = pmdp_collapse_flush(vma, addr, pmd);
 			spin_unlock(ptl);
 			up_write(&vma->vm_mm->mmap_sem);
-			atomic_long_dec(&vma->vm_mm->nr_ptes);
+			mm_dec_nr_ptes(vma->vm_mm);
 			pte_free(vma->vm_mm, pmd_pgtable(_pmd));
 		}
 	}
diff --git a/mm/memory.c b/mm/memory.c
index 6bbd407..6dec21b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -438,7 +438,7 @@ static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
 	pgtable_t token = pmd_pgtable(*pmd);
 	pmd_clear(pmd);
 	pte_free_tlb(tlb, token, addr);
-	atomic_long_dec(&tlb->mm->nr_ptes);
+	mm_dec_nr_ptes(tlb->mm);
 }
 
 static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
@@ -666,7 +666,7 @@ int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
 
 	ptl = pmd_lock(mm, pmd);
 	if (likely(pmd_none(*pmd))) {	/* Has another populated it ? */
-		atomic_long_inc(&mm->nr_ptes);
+		mm_inc_nr_ptes(mm);
 		pmd_populate(mm, pmd, new);
 		new = NULL;
 	}
@@ -3238,7 +3238,7 @@ static int pte_alloc_one_map(struct vm_fault *vmf)
 			goto map_pte;
 		}
 
-		atomic_long_inc(&vma->vm_mm->nr_ptes);
+		mm_inc_nr_ptes(vma->vm_mm);
 		pmd_populate(vma->vm_mm, vmf->pmd, vmf->prealloc_pte);
 		spin_unlock(vmf->ptl);
 		vmf->prealloc_pte = NULL;
@@ -3297,7 +3297,7 @@ static void deposit_prealloc_pte(struct vm_fault *vmf)
 	 * We are going to consume the prealloc table,
 	 * count that as nr_ptes.
 	 */
-	atomic_long_inc(&vma->vm_mm->nr_ptes);
+	mm_inc_nr_ptes(vma->vm_mm);
 	vmf->prealloc_pte = NULL;
 }
 
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index f642a45..f930014 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -221,8 +221,7 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
 	 * task's rss, pagetable and swap space use.
 	 */
 	points = get_mm_rss(p->mm) + get_mm_counter(p->mm, MM_SWAPENTS) +
-		atomic_long_read(&p->mm->nr_ptes) + mm_nr_pmds(p->mm) +
-		mm_nr_puds(p->mm);
+		mm_nr_ptes(p->mm) + mm_nr_pmds(p->mm) + mm_nr_puds(p->mm);
 	task_unlock(p);
 
 	/*
@@ -417,7 +416,7 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
 		pr_info("[%5d] %5d %5d %8lu %8lu %7ld %7ld %7ld %8lu         %5hd %s\n",
 			task->pid, from_kuid(&init_user_ns, task_uid(task)),
 			task->tgid, task->mm->total_vm, get_mm_rss(task->mm),
-			atomic_long_read(&task->mm->nr_ptes),
+			mm_nr_ptes(task->mm),
 			mm_nr_pmds(task->mm),
 			mm_nr_puds(task->mm),
 			get_mm_counter(task->mm, MM_SWAPENTS),