[PATCH v3 13/21] crypto/arm64: nhpoly1305 - Switch to 'ksimd' scoped guard API

Ard Biesheuvel
2025-10-08T15:47:01Z

Switch to the more abstract 'scoped_ksimd()' API, which will be modified
in a future patch to transparently allocate a kernel mode FP/SIMD state
buffer on the stack, so that kernel mode FP/SIMD code remains
preemptible in principe, but without the memory overhead that adds 528
bytes to the size of struct task_struct.

Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm64/crypto/nhpoly1305-neon-glue.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/crypto/nhpoly1305-neon-glue.c b/arch/arm64/crypto/nhpoly1305-neon-glue.c
index e4a0b463f080..013de6ac569a 100644
--- a/arch/arm64/crypto/nhpoly1305-neon-glue.c
+++ b/arch/arm64/crypto/nhpoly1305-neon-glue.c
@@ -25,9 +25,8 @@ static int nhpoly1305_neon_update(struct shash_desc *desc,
do {
unsigned int n = min_t(unsigned int, srclen, SZ_4K);

- kernel_neon_begin();
- crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
- kernel_neon_end();
+ scoped_ksimd()
+ crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
src += n;
srclen -= n;
} while (srclen);
--
2.51.0.710.ga91ca5db03-goog