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/* SPDX-License-Identifier: GPL-2.0-only */ /* * linux/arch/arm/include/asm/neon.h * * Copyright (C) 2013 Linaro Ltd <[email protected]> */ #include <asm/hwcap.h> #define cpu_has_neon() (!!(elf_hwcap & HWCAP_NEON)) #ifdef __ARM_NEON__ /* * If you are affected by the BUILD_BUG below, it probably means that you are * using NEON code /and/ calling the kernel_neon_begin() function from the same * compilation unit. To prevent issues that may arise from GCC reordering or * generating(1) NEON instructions outside of these begin/end functions, the * only supported way of using NEON code in the kernel is by isolating it in a * separate compilation unit, and calling it from another unit from inside a * kernel_neon_begin/kernel_neon_end pair. * * (1) Current GCC (4.7) might generate NEON instructions at O3 level if * -mpfu=neon is set. */ #define kernel_neon_begin() \ BUILD_BUG_ON_MSG(1, "kernel_neon_begin() called from NEON code") #else void kernel_neon_begin(void); #endif void kernel_neon_end(void);