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Wed, 08 Oct 2025 08:46:50 -0700 (PDT) Date: Wed, 8 Oct 2025 17:45:39 +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=1073; i=ardb@kernel.org; h=from:subject; bh=03C5PCob8A/RgOeAQHX/4ZCOM9qpxWhAP4TBfsL5DQ8=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIeNZu67vx5bzQuJBJ9VNz8z77964fOkps5iNBqHnH35iW FNVeKyro5SFQYyLQVZMkUVg9t93O09PlKp1niULM4eVCWQIAxenAEzEfSrDH/4Xk6WsfxU6r3kX 4aVd5JkRbTaTSd1xptHVuhknJe8+PMbwP9hcNNXGOvjmNMd69f/504wueGtfWLcnMH7vf2vbg56 K/AA= X-Mailer: git-send-email 2.51.0.710.ga91ca5db03-goog Message-ID: <20251008154533.3089255-28-ardb+git@google.com> Subject: [PATCH v3 05/21] ARM/simd: Add scoped guard API for kernel mode SIMD 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 , Kees Cook Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251008_084653_942362_FBF38356 X-CRM114-Status: GOOD ( 11.07 ) 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 Implement the ksimd scoped guard API so that it can be used by code that supports both ARM and arm64. Reviewed-by: Kees Cook Reviewed-by: Eric Biggers Signed-off-by: Ard Biesheuvel --- arch/arm/include/asm/simd.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm/include/asm/simd.h b/arch/arm/include/asm/simd.h index be08a8da046f..8549fa8b7253 100644 --- a/arch/arm/include/asm/simd.h +++ b/arch/arm/include/asm/simd.h @@ -2,14 +2,21 @@ #ifndef _ASM_SIMD_H #define _ASM_SIMD_H +#include #include #include #include +#include + static __must_check inline bool may_use_simd(void) { return IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && !in_hardirq() && !irqs_disabled(); } +DEFINE_LOCK_GUARD_0(ksimd, kernel_neon_begin(), kernel_neon_end()) + +#define scoped_ksimd() scoped_guard(ksimd) + #endif /* _ASM_SIMD_H */ -- 2.51.0.710.ga91ca5db03-goog