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

Hugh Dickins
2023-06-09T01:23:28Z

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@google.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
---
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