[PATCH v2 3/4] mm/memfd_luo: remove unnecessary memset in zero-size memfd path

Chenghao Duan
2026-03-23T11:08:06Z

The memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)) call in the zero-size
file handling path is unnecessary because the allocation of the ser
structure already uses the __GFP_ZERO flag, ensuring the memory is
already zero-initialized.

Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Chenghao Duan <duanchenghao@kylinos.cn>
---
mm/memfd_luo.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c
index 2a01eaff03c2..bf827e574bec 100644
--- a/mm/memfd_luo.c
+++ b/mm/memfd_luo.c
@@ -103,7 +103,6 @@ static int memfd_luo_preserve_folios(struct file *file,
if (!size) {
*nr_foliosp = 0;
*out_folios_ser = NULL;
- memset(kho_vmalloc, 0, sizeof(*kho_vmalloc));
return 0;
}

--
2.25.1