From: Ard Biesheuvel <ardb@kernel.org>
Date: Wed, 17 Sep 2025 21:28:22 +0000 (+0200)
Subject: crypto/arm64: aes-ce-ccm - Avoid pointless yield of the NEON unit
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e9426f3e6bd408aaf6f484b2b43eddd63c6b3f8c;p=thirdparty%2Fkernel%2Flinux.git

crypto/arm64: aes-ce-ccm - Avoid pointless yield of the NEON unit

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>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---

diff --git a/arch/arm64/crypto/aes-ce-ccm-glue.c b/arch/arm64/crypto/aes-ce-ccm-glue.c
index 2d791d51891b4..2eb4e76cabc3a 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);