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Wed, 08 Oct 2025 08:46:59 -0700 (PDT) Date: Wed, 8 Oct 2025 17:45:47 +0200 In-Reply-To: <20251008154533.3089255-23-ardb+git@google.com> Mime-Version: 1.0 References: <20251008154533.3089255-23-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=1189; i=ardb@kernel.org; h=from:subject; bh=8sN9JxLWvPrUJL2U51Eh+5qEYXWcAYa7eZ5mEETt20c=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIeNZu/PzMHauZxLCKuERrRdfzF5wf7kDA39FxuHFVmtm5 k9ZGbCyo5SFQYyLQVZMkUVg9t93O09PlKp1niULM4eVCWQIAxenAEzkiCIjw9wiF2ODjCNqLeKT 1y57HJa2ecbP6MIlHaFB7NPv73o48RIjw6d9u7u+haqfKfBVlgpP4bO+/M9SaGnMwn/JDUovz4U dZAIA X-Mailer: git-send-email 2.51.0.710.ga91ca5db03-goog Message-ID: <20251008154533.3089255-36-ardb+git@google.com> Subject: [PATCH v3 13/21] crypto/arm64: nhpoly1305 - 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-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251008_084701_792101_CE1F3EA2 X-CRM114-Status: GOOD ( 11.47 ) 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 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/nhpoly1305-neon-glue.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/arm64/crypto/nhpoly1305-neon-glue.c b/arch/arm64/crypto/nhpoly1305-neon-glue.c index e4a0b463f080..013de6ac569a 100644 --- a/arch/arm64/crypto/nhpoly1305-neon-glue.c +++ b/arch/arm64/crypto/nhpoly1305-neon-glue.c @@ -25,9 +25,8 @@ static int nhpoly1305_neon_update(struct shash_desc *desc, do { unsigned int n = min_t(unsigned int, srclen, SZ_4K); - kernel_neon_begin(); - crypto_nhpoly1305_update_helper(desc, src, n, nh_neon); - kernel_neon_end(); + scoped_ksimd() + crypto_nhpoly1305_update_helper(desc, src, n, nh_neon); src += n; srclen -= n; } while (srclen); -- 2.51.0.710.ga91ca5db03-goog