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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/arch/arm64/include/asm/simd.h
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@@ -1,9 +1,6 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published
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- * by the Free Software Foundation.
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  */
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 #ifndef __ASM_SIMD_H
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@@ -15,9 +12,9 @@
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 #include <linux/preempt.h>
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 #include <linux/types.h>
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-#ifdef CONFIG_KERNEL_MODE_NEON
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+DECLARE_PER_CPU(bool, fpsimd_context_busy);
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-DECLARE_PER_CPU(bool, kernel_neon_busy);
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+#ifdef CONFIG_KERNEL_MODE_NEON
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 /*
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  * may_use_simd - whether it is allowable at this time to issue SIMD
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@@ -29,15 +26,17 @@
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 static __must_check inline bool may_use_simd(void)
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 {
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 	/*
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-	 * kernel_neon_busy is only set while preemption is disabled,
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+	 * We must make sure that the SVE has been initialized properly
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+	 * before using the SIMD in kernel.
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+	 * fpsimd_context_busy is only set while preemption is disabled,
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 	 * and is clear whenever preemption is enabled. Since
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-	 * this_cpu_read() is atomic w.r.t. preemption, kernel_neon_busy
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+	 * this_cpu_read() is atomic w.r.t. preemption, fpsimd_context_busy
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 	 * cannot change under our feet -- if it's set we cannot be
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 	 * migrated, and if it's clear we cannot be migrated to a CPU
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 	 * where it is set.
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 	 */
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 	return !in_irq() && !irqs_disabled() && !in_nmi() &&
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-		!this_cpu_read(kernel_neon_busy);
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+	       !this_cpu_read(fpsimd_context_busy);
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 }
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 #else /* ! CONFIG_KERNEL_MODE_NEON */