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Wed, 17 Sep 2025 23:36:08 -0700 (PDT) Date: Thu, 18 Sep 2025 08:35:41 +0200 In-Reply-To: <20250918063539.2640512-7-ardb+git@google.com> Mime-Version: 1.0 References: <20250918063539.2640512-7-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=877; i=ardb@kernel.org; h=from:subject; bh=XBh8pq2KsPALfmaJFm04pRdLlOab2MUmglzVdmLzRgY=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIeP0CtusBs1FB0Ilkqf/6511vMyv3m3WTW7p2cK6mvmG7 y7Ky/R1lLIwiHExyIopsgjM/vtu5+mJUrXOs2Rh5rAygQxh4OIUgInwLWFkeLtZV0eJ14IlZdrh Z49bnoeq/lx+6g2z4IXFWotOFsbOT2Zk2Mr280O4kl3o6UN71aymdmzevvzOMfesD5F33m26171 7HSsA X-Mailer: git-send-email 2.51.0.384.g4c02a37b29-goog Message-ID: <20250918063539.2640512-8-ardb+git@google.com> Subject: [PATCH 1/5] crypto/arm64: aes-ce-ccm - Avoid pointless yield of the NEON unit From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, herbert@gondor.apana.org.au, ebiggers@kernel.org, Ard Biesheuvel , Marc Zyngier , Will Deacon , Mark Rutland , Kees Cook , Catalin Marinas , Mark Brown Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250917_233610_856888_3CA8BFCD X-CRM114-Status: GOOD ( 12.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ard Biesheuvel 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. Signed-off-by: Ard Biesheuvel --- 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); -- 2.51.0.384.g4c02a37b29-goog