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Fri, 31 Oct 2025 03:39:50 -0700 (PDT) Date: Fri, 31 Oct 2025 11:39:04 +0100 In-Reply-To: <20251031103858.529530-23-ardb+git@google.com> 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=1073; i=ardb@kernel.org; h=from:subject; bh=M/7s7wcn0cdKhOhqASUBxonxhz5yy2SsKjo9N/ZpQ7w=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIZNl4qnyS8sPKb69IFY1+c0PRoPgI+G1QUYH3jPN7vrGE 6knvD2no5SFQYyLQVZMkUVg9t93O09PlKp1niULM4eVCWQIAxenAEykLJHhN0tBTKn6F6d2/Y0J FcET91VJ/rMuz/7h8zTBUu/D4nWvvzP8U13ef0Rt2iy/1D9zLa/cenzYpJVfaIUx26dve6cuSHw YxAQA X-Mailer: git-send-email 2.51.1.930.gacf6e81ea2-goog Message-ID: <20251031103858.529530-28-ardb+git@google.com> Subject: [PATCH v4 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-20251031_033953_127080_E21B3621 X-CRM114-Status: GOOD ( 10.19 ) 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 */ -- 2.51.1.930.gacf6e81ea2-goog