linux-kernel - [PATCH 52/94] mm: Introduce vma_next() and vma

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Message-ID: <20210428153542.2814175-53-Liam.Howlett@Oracle.com>
Date:   Wed, 28 Apr 2021 15:36:14 +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>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        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>,
        Michel Lespinasse <walken.cr@...il.com>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH 52/94] mm: Introduce vma_next() and vma_prev()

Rename internal vma_next() to _vma_next().

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 include/linux/mm.h | 33 +++++++++++++++++++++++++++++++++
 mm/mmap.c          | 12 ++++++------
 2 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index cbc79a9fa911..82b076787515 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2694,6 +2694,24 @@ 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)
+{
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
+
+	mas_set(&mas, vma->vm_end);
+	return mas_next(&mas, ULONG_MAX);
+}
+
+static inline struct vm_area_struct *vma_prev(struct mm_struct *mm,
+			const struct vm_area_struct *vma)
+{
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
+
+	mas_set(&mas, vma->vm_start);
+	return mas_prev(&mas, 0);
+}
+
 static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
 {
 	unsigned long vm_start = vma->vm_start;
@@ -2735,6 +2753,21 @@ static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
 	return vma;
 }
 
+static inline struct vm_area_struct *vma_mas_next(struct ma_state *mas)
+{
+	struct ma_state tmp;
+
+	memcpy(&tmp, mas, sizeof(tmp));
+	return mas_next(&tmp, ULONG_MAX);
+}
+
+static inline struct vm_area_struct *vma_mas_prev(struct ma_state *mas)
+{
+	struct ma_state tmp;
+
+	memcpy(&tmp, mas, sizeof(tmp));
+	return mas_prev(&tmp, 0);
+}
 static inline bool range_in_vma(struct vm_area_struct *vma,
 				unsigned long start, unsigned long end)
 {
diff --git a/mm/mmap.c b/mm/mmap.c
index a8e4f836b167..51a29bb789ba 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -481,7 +481,7 @@ static 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.
  *
@@ -489,7 +489,7 @@ static 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)
@@ -1144,7 +1144,7 @@ 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;
@@ -2302,7 +2302,7 @@ 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();
@@ -2453,7 +2453,7 @@ static int 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 {
@@ -2470,7 +2470,7 @@ static int 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