[v4 PATCH 7/8] mm: khugepaged: introduce khugepaged_enter_vma() helper

[Yang Shi]

The khugepaged_enter_vma_merge() actually does as the same thing as the
khugepaged_enter() section called by shmem_mmap(), so consolidate them
into one helper and rename it to khugepaged_enter_vma().

Acked-by: Vlastmil Babka <vbabka@xxxxxxx>
Signed-off-by: Yang Shi <shy828301@xxxxxxxxx>
---
 include/linux/khugepaged.h |  8 ++++----
 mm/khugepaged.c            |  6 +++---
 mm/mmap.c                  | 12 ++++++------
 mm/shmem.c                 | 12 ++----------
 4 files changed, 15 insertions(+), 23 deletions(-)

diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h
index c340f6bb39d6..392d34c3c59a 100644
--- a/include/linux/khugepaged.h
+++ b/include/linux/khugepaged.h
@@ -14,8 +14,8 @@ extern bool hugepage_vma_check(struct vm_area_struct *vma,
 			       unsigned long vm_flags);
 extern void __khugepaged_enter(struct mm_struct *mm);
 extern void __khugepaged_exit(struct mm_struct *mm);
-extern void khugepaged_enter_vma_merge(struct vm_area_struct *vma,
-				       unsigned long vm_flags);
+extern void khugepaged_enter_vma(struct vm_area_struct *vma,
+				 unsigned long vm_flags);
 extern void khugepaged_min_free_kbytes_update(void);
 #ifdef CONFIG_SHMEM
 extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
@@ -72,8 +72,8 @@ static inline void khugepaged_enter(struct vm_area_struct *vma,
 				    unsigned long vm_flags)
 {
 }
-static inline void khugepaged_enter_vma_merge(struct vm_area_struct *vma,
-					      unsigned long vm_flags)
+static inline void khugepaged_enter_vma(struct vm_area_struct *vma,
+					unsigned long vm_flags)
 {
 }
 static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index dec449339964..32db587c5224 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -365,7 +365,7 @@ int hugepage_madvise(struct vm_area_struct *vma,
 		 * register it here without waiting a page fault that
 		 * may not happen any time soon.
 		 */
-		khugepaged_enter_vma_merge(vma, *vm_flags);
+		khugepaged_enter_vma(vma, *vm_flags);
 		break;
 	case MADV_NOHUGEPAGE:
 		*vm_flags &= ~VM_HUGEPAGE;
@@ -505,8 +505,8 @@ void __khugepaged_enter(struct mm_struct *mm)
 		wake_up_interruptible(&khugepaged_wait);
 }
 
-void khugepaged_enter_vma_merge(struct vm_area_struct *vma,
-			       unsigned long vm_flags)
+void khugepaged_enter_vma(struct vm_area_struct *vma,
+			  unsigned long vm_flags)
 {
 	if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) &&
 	    khugepaged_enabled() &&
diff --git a/mm/mmap.c b/mm/mmap.c
index 3445a8c304af..34ff1600426c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1122,7 +1122,7 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm,
 					 end, prev->vm_pgoff, NULL, prev);
 		if (err)
 			return NULL;
-		khugepaged_enter_vma_merge(prev, vm_flags);
+		khugepaged_enter_vma(prev, vm_flags);
 		return prev;
 	}
 
@@ -1149,7 +1149,7 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm,
 		}
 		if (err)
 			return NULL;
-		khugepaged_enter_vma_merge(area, vm_flags);
+		khugepaged_enter_vma(area, vm_flags);
 		return area;
 	}
 
@@ -2046,7 +2046,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
 		}
 	}
 	anon_vma_unlock_write(vma->anon_vma);
-	khugepaged_enter_vma_merge(vma, vma->vm_flags);
+	khugepaged_enter_vma(vma, vma->vm_flags);
 	return error;
 }
 #endif /* CONFIG_STACK_GROWSUP || CONFIG_IA64 */
@@ -2127,7 +2127,7 @@ int expand_downwards(struct vm_area_struct *vma, unsigned long address)
 		}
 	}
 	anon_vma_unlock_write(vma->anon_vma);
-	khugepaged_enter_vma_merge(vma, vma->vm_flags);
+	khugepaged_enter_vma(vma, vma->vm_flags);
 	return error;
 }
 
@@ -2635,7 +2635,7 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 	/* Actually expand, if possible */
 	if (vma &&
 	    !vma_expand(&mas, vma, merge_start, merge_end, vm_pgoff, next)) {
-		khugepaged_enter_vma_merge(vma, vm_flags);
+		khugepaged_enter_vma(vma, vm_flags);
 		goto expanded;
 	}
 
@@ -3051,7 +3051,7 @@ static int do_brk_flags(struct ma_state *mas, struct vm_area_struct *vma,
 			anon_vma_interval_tree_post_update_vma(vma);
 			anon_vma_unlock_write(vma->anon_vma);
 		}
-		khugepaged_enter_vma_merge(vma, flags);
+		khugepaged_enter_vma(vma, flags);
 		goto out;
 	}
 
diff --git a/mm/shmem.c b/mm/shmem.c
index 29701be579f8..89f6f4fec3f9 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2232,11 +2232,7 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
 
 	file_accessed(file);
 	vma->vm_ops = &shmem_vm_ops;
-	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
-			((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) <
-			(vma->vm_end & HPAGE_PMD_MASK)) {
-		khugepaged_enter(vma, vma->vm_flags);
-	}
+	khugepaged_enter_vma(vma, vma->vm_flags);
 	return 0;
 }
 
@@ -4137,11 +4133,7 @@ int shmem_zero_setup(struct vm_area_struct *vma)
 	vma->vm_file = file;
 	vma->vm_ops = &shmem_vm_ops;
 
-	if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) &&
-			((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) <
-			(vma->vm_end & HPAGE_PMD_MASK)) {
-		khugepaged_enter(vma, vma->vm_flags);
-	}
+	khugepaged_enter_vma(vma, vma->vm_flags);
 
 	return 0;
 }
-- 
2.26.3