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Fri, 31 Oct 2025 03:40:00 -0700 (PDT) Date: Fri, 31 Oct 2025 11:39:14 +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=1531; i=ardb@kernel.org; h=from:subject; bh=HC3oKa6XX6UzW4T61UkwwEg9itjK9pSOgUvVasKYlBk=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIZNl4k3lqGSf0tTW9dM3lu6fuKnZar2H1FFe5v+PezZ0m Zeta/vfUcrCIMbFICumyCIw+++7nacnStU6z5KFmcPKBDKEgYtTACbytZ3hn21Qzpv8ZRv+Har8 9KmtbbbpjscfoguOVrx0LerWOarod5uRYUuDAgP/9kk7Mvbetlm0MWDyzq03jO+IzUisMv9cprf QmxkA X-Mailer: git-send-email 2.51.1.930.gacf6e81ea2-goog Message-ID: <20251031103858.529530-38-ardb+git@google.com> Subject: [PATCH v4 15/21] crypto/arm64: sha3 - 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/sha3-ce-glue.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/arch/arm64/crypto/sha3-ce-glue.c b/arch/arm64/crypto/sha3-ce-g= lue.c index b4f1001046c9..22732760edd3 100644 --- a/arch/arm64/crypto/sha3-ce-glue.c +++ b/arch/arm64/crypto/sha3-ce-glue.c @@ -46,9 +46,8 @@ static int sha3_update(struct shash_desc *desc, const u8 = *data, do { int rem; =20 - kernel_neon_begin(); - rem =3D sha3_ce_transform(sctx->st, data, blocks, ds); - kernel_neon_end(); + scoped_ksimd() + rem =3D sha3_ce_transform(sctx->st, data, blocks, ds); data +=3D (blocks - rem) * bs; blocks =3D rem; } while (blocks); @@ -73,9 +72,8 @@ static int sha3_finup(struct shash_desc *desc, const u8 *= src, unsigned int len, memset(block + len, 0, bs - len); block[bs - 1] |=3D 0x80; =20 - kernel_neon_begin(); - sha3_ce_transform(sctx->st, block, 1, ds); - kernel_neon_end(); + scoped_ksimd() + sha3_ce_transform(sctx->st, block, 1, ds); memzero_explicit(block , sizeof(block)); =20 for (i =3D 0; i < ds / 8; i++) --=20 2.51.1.930.gacf6e81ea2-goog