[PATCH v3 01/21] crypto/arm64: aes-ce-ccm - Avoid pointless yield of the NEON unit

Ard Biesheuvel
2025-10-08T15:46:47Z

Kernel mode NEON sections are now preemptible on arm64, and so there is
no need to yield it explicitly in order to prevent scheduling latency
spikes.

Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/arm64/crypto/aes-ce-ccm-glue.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/arm64/crypto/aes-ce-ccm-glue.c b/arch/arm64/crypto/aes-ce-ccm-glue.c
index 2d791d51891b..2eb4e76cabc3 100644
--- a/arch/arm64/crypto/aes-ce-ccm-glue.c
+++ b/arch/arm64/crypto/aes-ce-ccm-glue.c
@@ -114,11 +114,8 @@ static u32 ce_aes_ccm_auth_data(u8 mac[], u8 const in[], u32 abytes,
in += adv;
abytes -= adv;

- if (unlikely(rem)) {
- kernel_neon_end();
- kernel_neon_begin();
+ if (unlikely(rem))
macp = 0;
- }
} else {
u32 l = min(AES_BLOCK_SIZE - macp, abytes);

--
2.51.0.710.ga91ca5db03-goog