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Fri, 31 Oct 2025 03:40:01 -0700 (PDT) Date: Fri, 31 Oct 2025 11:39:15 +0100 In-Reply-To: <20251031103858.529530-23-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251031103858.529530-23-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=3235; i=ardb@kernel.org; h=from:subject; bh=BmcyRj2En4D2bqTYOu3u59S/hVwg5l7rSd12ZpuUTBI=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIZNl4i3DFR/fNq1Xakt8FWTJdOhpvVsDwyGJ7E3WhxY8W eL7YfO/jlIWBjEuBlkxRRaB2X/f7Tw9UarWeZYszBxWJpAhDFycAjAREXVGhnVfdl04dOv5V9/U g4f3qN4+xbZ6/aX0qa92dd2dOcdIdd4bRoYprzoDmf2F1r7MzJdLrtM6/3EWn+/hW98LH/u82rz 40ixWAA== X-Mailer: git-send-email 2.51.1.930.gacf6e81ea2-goog Message-ID: <20251031103858.529530-39-ardb+git@google.com> Subject: [PATCH v4 16/21] crypto/arm64: sm3 - Switch to 'ksimd' scoped guard API From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, ebiggers@kernel.org, Ard Biesheuvel Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ard Biesheuvel Switch to the more abstract 'scoped_ksimd()' API, which will be modified in a future patch to transparently allocate a kernel mode FP/SIMD state buffer on the stack, so that kernel mode FP/SIMD code remains preemptible in principe, but without the memory overhead that adds 528 bytes to the size of struct task_struct. Reviewed-by: Eric Biggers Signed-off-by: Ard Biesheuvel --- arch/arm64/crypto/sm3-ce-glue.c | 15 ++++++++------- arch/arm64/crypto/sm3-neon-glue.c | 16 ++++++---------- 2 files changed, 14 insertions(+), 17 deletions(-) diff --git a/arch/arm64/crypto/sm3-ce-glue.c b/arch/arm64/crypto/sm3-ce-glu= e.c index eac6f5fa0abe..24c1fcfae072 100644 --- a/arch/arm64/crypto/sm3-ce-glue.c +++ b/arch/arm64/crypto/sm3-ce-glue.c @@ -5,7 +5,6 @@ * Copyright (C) 2018 Linaro Ltd */ =20 -#include #include #include #include @@ -13,6 +12,8 @@ #include #include =20 +#include + MODULE_DESCRIPTION("SM3 secure hash using ARMv8 Crypto Extensions"); MODULE_AUTHOR("Ard Biesheuvel "); MODULE_LICENSE("GPL v2"); @@ -25,18 +26,18 @@ static int sm3_ce_update(struct shash_desc *desc, const= u8 *data, { int remain; =20 - kernel_neon_begin(); - remain =3D sm3_base_do_update_blocks(desc, data, len, sm3_ce_transform); - kernel_neon_end(); + scoped_ksimd() { + remain =3D sm3_base_do_update_blocks(desc, data, len, sm3_ce_transform); + } return remain; } =20 static int sm3_ce_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { - kernel_neon_begin(); - sm3_base_do_finup(desc, data, len, sm3_ce_transform); - kernel_neon_end(); + scoped_ksimd() { + sm3_base_do_finup(desc, data, len, sm3_ce_transform); + } return sm3_base_finish(desc, out); } =20 diff --git a/arch/arm64/crypto/sm3-neon-glue.c b/arch/arm64/crypto/sm3-neon= -glue.c index 6c4611a503a3..15f30cc24f32 100644 --- a/arch/arm64/crypto/sm3-neon-glue.c +++ b/arch/arm64/crypto/sm3-neon-glue.c @@ -5,7 +5,7 @@ * Copyright (C) 2022 Tianjia Zhang */ =20 -#include +#include #include #include #include @@ -20,20 +20,16 @@ asmlinkage void sm3_neon_transform(struct sm3_state *ss= t, u8 const *src, static int sm3_neon_update(struct shash_desc *desc, const u8 *data, unsigned int len) { - int remain; - - kernel_neon_begin(); - remain =3D sm3_base_do_update_blocks(desc, data, len, sm3_neon_transform); - kernel_neon_end(); - return remain; + scoped_ksimd() + return sm3_base_do_update_blocks(desc, data, len, + sm3_neon_transform); } =20 static int sm3_neon_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) { - kernel_neon_begin(); - sm3_base_do_finup(desc, data, len, sm3_neon_transform); - kernel_neon_end(); + scoped_ksimd() + sm3_base_do_finup(desc, data, len, sm3_neon_transform); return sm3_base_finish(desc, out); } =20 --=20 2.51.1.930.gacf6e81ea2-goog