[PATCH v2 13/32] mm/hmm: retry if pte_offset_map() fails

[Hugh Dickins]

hmm_vma_walk_pmd() is called through mm_walk, but already has a goto
again loop of its own, so take part in that if pte_offset_map() fails.

Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Reviewed-by: Alistair Popple <apopple@xxxxxxxxxx>
---
 mm/hmm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/hmm.c b/mm/hmm.c
index e23043345615..b1a9159d7c92 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -381,6 +381,8 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
 	}
 
 	ptep = pte_offset_map(pmdp, addr);
+	if (!ptep)
+		goto again;
 	for (; addr < end; addr += PAGE_SIZE, ptep++, hmm_pfns++) {
 		int r;
 
-- 
2.35.3