When a vma is known, avoid calling mm_populate to search for the vma to
populate.
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
include/linux/mm.h | 4 ++++
mm/gup.c | 20 ++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index dbb83118eba09..baaad07c43c99 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2587,8 +2587,12 @@ static inline void mm_populate(unsigned long addr, unsigned long len)
/* Ignore errors */
(void) __mm_populate(addr, len, 1);
}
+extern void mm_populate_vma(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end);
#else
static inline void mm_populate(unsigned long addr, unsigned long len) {}
+void mm_populate_vma(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end) {}
#endif
/* These take the mm semaphore themselves */
diff --git a/mm/gup.c b/mm/gup.c
index 98eb8e6d2609c..b06e2a6d90187 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1431,6 +1431,26 @@ long populate_vma_page_range(struct vm_area_struct *vma,
NULL, NULL, locked);
}
+/*
+ * mm_populate_vma() - Populate a single range in a single vma.
+ * @vma: The vma to populate.
+ * @start: The start address to populate
+ * @end: The end address to stop populating
+ *
+ * Note: Ignores errors.
+ */
+void mm_populate_vma(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ struct mm_struct *mm = current->mm;
+ int locked = 1;
+
+ mmap_read_lock(mm);
+ populate_vma_page_range(vma, start, end, &locked);
+ if (locked)
+ mmap_read_unlock(mm);
+}
+
/*
* __mm_populate - populate and/or mlock pages within a range of address space.
*
--
2.28.0
