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Wed, 01 Oct 2025 14:03:58 -0700 (PDT) Date: Wed, 1 Oct 2025 23:02:08 +0200 In-Reply-To: <20251001210201.838686-22-ardb+git@google.com> Mime-Version: 1.0 References: <20251001210201.838686-22-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=923; i=ardb@kernel.org; h=from:subject; bh=cfu0++gxesQ+j0mFCsE0nnO6ije/EROXIJJwVNT18uY=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIePutMcBulsb9Sf4Rn696XB38WaDfWe15F4pq8cpdulUF insmBLQUcrCIMbFICumyCIw+++7nacnStU6z5KFmcPKBDKEgYtTACYiF8zwT73e6+Ks9K/+Zebd R+6sq/m6USFAcL2p+MU135V7PqktCmRk+LXMZ/6d0FIN7xxPpoX/jt5W3mGrLFV3wuGL08ZXstw XeQE= X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251001210201.838686-28-ardb+git@google.com> Subject: [PATCH v2 06/20] 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, linux@armlinux.org.uk, Ard Biesheuvel , Marc Zyngier , Will Deacon , Mark Rutland , Kees Cook , Catalin Marinas , Mark Brown , Eric Biggers Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251001_140400_794270_074C0109 X-CRM114-Status: GOOD ( 13.96 ) 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. Reviewed-by: Mark Brown 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); -- 2.51.0.618.g983fd99d29-goog