[PATCH 52/94] mm: Introduce vma_next() and vma_prev()

From: Liam Howlett
Date: Wed Apr 28 2021 - 11:42:23 EST


Rename internal vma_next() to _vma_next().

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
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