From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Move find_vma_intersection() to mmap.c and change implementation to
maple tree.
When searching for a vma within a range, it is easier to use the maple
tree interface.
Exported find_vma_intersection() for kvm module.
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
include/linux/mm.h | 25 ++++++-------------------
mm/mmap.c | 31 ++++++++++++++++++++++++++++++-
2 files changed, 36 insertions(+), 20 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 110b1dcfb036..72654108380e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2784,26 +2784,13 @@ extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long add
extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
struct vm_area_struct **pprev);
-/**
- * find_vma_intersection() - Look up the first VMA which intersects the interval
- * @mm: The process address space.
- * @start_addr: The inclusive start user address.
- * @end_addr: The exclusive end user address.
- *
- * Returns: The first VMA within the provided range, %NULL otherwise. Assumes
- * start_addr < end_addr.
+/*
+ * Look up the first VMA which intersects the interval [start_addr, end_addr)
+ * NULL if none. Assume start_addr < end_addr.
*/
-static inline
-struct vm_area_struct *find_vma_intersection(struct mm_struct *mm,
- unsigned long start_addr,
- unsigned long end_addr)
-{
- struct vm_area_struct *vma = find_vma(mm, start_addr);
-
- if (vma && end_addr <= vma->vm_start)
- vma = NULL;
- return vma;
-}
+extern struct vm_area_struct *find_vma_intersection(struct mm_struct *mm,
+ unsigned long start_addr,
+ unsigned long end_addr);
/**
* vma_lookup() - Find a VMA at a specific address
diff --git a/mm/mmap.c b/mm/mmap.c
index c080ea65215d..80ff8be0631b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2030,6 +2030,35 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
EXPORT_SYMBOL(get_unmapped_area);
+/**
+ * find_vma_intersection() - Look up the first VMA which intersects the interval
+ * @mm: The process address space.
+ * @start_addr: The inclusive start user address.
+ * @end_addr: The exclusive end user address.
+ *
+ * Returns: The first VMA within the provided range, %NULL otherwise. Assumes
+ * start_addr < end_addr.
+ */
+struct vm_area_struct *find_vma_intersection(struct mm_struct *mm,
+ unsigned long start_addr,
+ unsigned long end_addr)
+{
+ struct vm_area_struct *vma;
+ unsigned long index = start_addr;
+
+ mmap_assert_locked(mm);
+ /* Check the cache first. */
+ vma = vmacache_find(mm, start_addr);
+ if (likely(vma))
+ return vma;
+
+ vma = mt_find(&mm->mm_mt, &index, end_addr - 1);
+ if (vma)
+ vmacache_update(start_addr, vma);
+ return vma;
+}
+EXPORT_SYMBOL(find_vma_intersection);
+
/**
* find_vma() - Find the VMA for a given address, or the next vma.
* @mm: The mm_struct to check
@@ -2038,7 +2067,7 @@ EXPORT_SYMBOL(get_unmapped_area);
* Returns: The VMA associated with addr, or the next vma.
* May return %NULL in the case of no vma at addr or above.
*/
-struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
+inline struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
{
struct vm_area_struct *vma;
unsigned long index = addr;
--
2.34.1
