linux-kernel - [PATCH v2 27/70] mm: Introduce vma_next() and vma

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Date:   Tue, 12 Jan 2021 11:11:57 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...gle.com>, Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jerome Glisse <jglisse@...hat.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>
Subject: [PATCH v2 27/70] mm: Introduce vma_next() and vma_prev()

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 include/linux/mm.h | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 680dcfe07dbb6..99b1dec97495a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1647,7 +1647,7 @@ void zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
 void zap_page_range(struct vm_area_struct *vma, unsigned long address,
 		    unsigned long size);
 void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
-		unsigned long start, unsigned long end);
+		struct ma_state *mas, unsigned long start, unsigned long end);
 
 struct mmu_notifier_range;
 
@@ -2654,6 +2654,24 @@ extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned lon
 extern struct vm_area_struct *find_vma_intersection(struct mm_struct *mm,
 		     unsigned long start_addr, unsigned long end_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;
@@ -2695,6 +2713,21 @@ 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)
 {
-- 
2.28.0