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Message-ID: <20251001210201.838686-28-ardb+git@google.com>
Date: Wed, 1 Oct 2025 23:02:08 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
herbert@...dor.apana.org.au, linux@...linux.org.uk,
Ard Biesheuvel <ardb@...nel.org>, Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
Mark Rutland <mark.rutland@....com>, Kees Cook <keescook@...omium.org>,
Catalin Marinas <catalin.marinas@....com>, Mark Brown <broonie@...nel.org>,
Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH v2 06/20] crypto/arm64: aes-ce-ccm - Avoid pointless yield of
the NEON unit
From: Ard Biesheuvel <ardb@...nel.org>
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: Mark Brown <broonie@...nel.org>
Signed-off-by: Ard Biesheuvel <ardb@...nel.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);
--
2.51.0.618.g983fd99d29-goog
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