scan_pmd() requires mmap_lock held in read. Add a lockdep assertion to
guard this condition, as scan_pmd() will be called from other contexts
later in the series.
Signed-off-by: Zach O'Keefe <zokeefe@xxxxxxxxxx>
---
mm/khugepaged.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index b204bc1eefa7..56f2ef7146c7 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1253,6 +1253,7 @@ struct scan_pmd_result {
struct page *head;
};
+/* Called with mmap_lock held and does not drop it. */
static void scan_pmd(struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long address,
@@ -1267,6 +1268,7 @@ static void scan_pmd(struct mm_struct *mm,
spinlock_t *ptl;
int node = NUMA_NO_NODE;
+ mmap_assert_locked(mm);
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
pmd = mm_find_pmd(mm, address);
--
2.35.1.616.g0bdcbb4464-goog
