mm: khugepaged: make hugepage_vma_check() non-static

The hugepage_vma_check() could be reused by khugepaged_enter() and khugepaged_enter_vma_merge(), but it is static in khugepaged.c. Make it non-static and declare it in khugepaged.h. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Yang Shi <[email protected]> Suggested-by: Vlastimil Babka <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Matthew Wilcox (Oracle) <[email protected]> Cc: Miaohe Lin <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Song Liu <[email protected]> Cc: Song Liu <[email protected]> Cc: Theodore Ts'o <[email protected]> Cc: Zi Yan <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
leonxia1018 · May 19, 2022 · 2647d11 · 2647d11
1 parent d2081b2
commit 2647d11
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Showing 2 changed files with 15 additions and 24 deletions.
diff --git a/include/linux/khugepaged.h b/include/linux/khugepaged.h
@@ -3,15 +3,15 @@
 #define _LINUX_KHUGEPAGED_H
 
 #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
-#include <linux/shmem_fs.h>
-
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 extern struct attribute_group khugepaged_attr_group;
 
 extern int khugepaged_init(void);
 extern void khugepaged_destroy(void);
 extern int start_stop_khugepaged(void);
+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,
@@ -55,13 +55,11 @@ static inline void khugepaged_exit(struct mm_struct *mm)
 static inline void khugepaged_enter(struct vm_area_struct *vma,
 				   unsigned long vm_flags)
 {
-	if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
-		if ((khugepaged_always() ||
-		     (shmem_file(vma->vm_file) && shmem_huge_enabled(vma)) ||
-		     (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
-		    !(vm_flags & VM_NOHUGEPAGE) &&
-		    !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
+	if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) &&
+	    khugepaged_enabled()) {
+		if (hugepage_vma_check(vma, vm_flags))
 			__khugepaged_enter(vma->vm_mm);
+	}
 }
 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 static inline void khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
@@ -437,8 +437,8 @@ static inline int khugepaged_test_exit(struct mm_struct *mm)
 	return atomic_read(&mm->mm_users) == 0;
 }
 
-static bool hugepage_vma_check(struct vm_area_struct *vma,
-			       unsigned long vm_flags)
+bool hugepage_vma_check(struct vm_area_struct *vma,
+			unsigned long vm_flags)
 {
 	if (!transhuge_vma_enabled(vma, vm_flags))
 		return false;
@@ -508,20 +508,13 @@ void __khugepaged_enter(struct mm_struct *mm)
 void khugepaged_enter_vma_merge(struct vm_area_struct *vma,
 			       unsigned long vm_flags)
 {
-	unsigned long hstart, hend;
-
-	/*
-	 * khugepaged only supports read-only files for non-shmem files.
-	 * khugepaged does not yet work on special mappings. And
-	 * file-private shmem THP is not supported.
-	 */
-	if (!hugepage_vma_check(vma, vm_flags))
-		return;
-
-	hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
-	hend = vma->vm_end & HPAGE_PMD_MASK;
-	if (hstart < hend)
-		khugepaged_enter(vma, vm_flags);
+	if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) &&
+	    khugepaged_enabled() &&
+	    (((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) <
+	     (vma->vm_end & HPAGE_PMD_MASK))) {
+		if (hugepage_vma_check(vma, vm_flags))
+			__khugepaged_enter(vma->vm_mm);
+	}
 }
 
 void __khugepaged_exit(struct mm_struct *mm)