linux-kernel - [PATCH v3 24/66] mm: Introduce vma_next() and vma

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Date:   Tue, 5 Oct 2021 01:30:46 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Douglas Gilbert <dgilbert@...erlog.com>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v3 24/66] mm: Introduce vma_next() and vma_prev()

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

Rename internal vma_next() to _vma_next().

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 include/linux/mm.h | 12 ++++++++++++
 mm/mmap.c          | 12 ++++++------
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ae1bf8087f03..68e315cb1056 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2701,6 +2701,18 @@ struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr)
        return mtree_load(&mm->mm_mt, addr);
 }
 
+static inline struct vm_area_struct *vma_next(struct mm_struct *mm,
+			const struct vm_area_struct *vma)
+{
+	return mt_next(&mm->mm_mt, vma->vm_end - 1, ULONG_MAX);
+}
+
+static inline struct vm_area_struct *vma_prev(struct mm_struct *mm,
+			const struct vm_area_struct *vma)
+{
+	return mt_prev(&mm->mm_mt, vma->vm_start, 0);
+}
+
 static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
 {
 	unsigned long vm_start = vma->vm_start;
diff --git a/mm/mmap.c b/mm/mmap.c
index 56da5a23e293..9b6765db14c0 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -483,7 +483,7 @@ bool range_has_overlap(struct mm_struct *mm, unsigned long start,
 }
 
 /*
- * vma_next() - Get the next VMA.
+ * _vma_next() - Get the next VMA or the first.
  * @mm: The mm_struct.
  * @vma: The current vma.
  *
@@ -491,7 +491,7 @@ bool range_has_overlap(struct mm_struct *mm, unsigned long start,
  *
  * Returns: The next VMA after @vma.
  */
-static inline struct vm_area_struct *vma_next(struct mm_struct *mm,
+static inline struct vm_area_struct *_vma_next(struct mm_struct *mm,
 					 struct vm_area_struct *vma)
 {
 	if (!vma)
@@ -1182,7 +1182,7 @@ struct vm_area_struct *vma_merge(struct mm_struct *mm,
 	if (vm_flags & VM_SPECIAL)
 		return NULL;
 
-	next = vma_next(mm, prev);
+	next = _vma_next(mm, prev);
 	area = next;
 	if (area && area->vm_end == end)		/* cases 6, 7, 8 */
 		next = next->vm_next;
@@ -2339,7 +2339,7 @@ static void unmap_region(struct mm_struct *mm,
 		struct vm_area_struct *vma, struct vm_area_struct *prev,
 		unsigned long start, unsigned long end)
 {
-	struct vm_area_struct *next = vma_next(mm, prev);
+	struct vm_area_struct *next = _vma_next(mm, prev);
 	struct mmu_gather tlb;
 
 	lru_add_drain();
@@ -2493,7 +2493,7 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
 		if (error)
 			return error;
 		prev = vma;
-		vma = vma_next(mm, prev);
+		vma = _vma_next(mm, prev);
 		mas->index = start;
 		mas_reset(mas);
 	} else {
@@ -2510,7 +2510,7 @@ do_mas_align_munmap(struct ma_state *mas, struct vm_area_struct *vma,
 		int error = __split_vma(mm, last, end, 1);
 		if (error)
 			return error;
-		vma = vma_next(mm, prev);
+		vma = _vma_next(mm, prev);
 		mas_reset(mas);
 	}
 
-- 
2.30.2