Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ARM/simd: Add scoped guard API for kernel mode SIMD
Implement the ksimd scoped guard API so that it can be used by code that
supports both ARM and arm64.
Reviewed-by: Kees Cook <kees@kernel.org>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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arch/arm/include/asm/simd.h
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arch/arm/include/asm/simd.h
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#ifndef _ASM_SIMD_H
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#define _ASM_SIMD_H
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#include <linux/cleanup.h>
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#include <linux/compiler_attributes.h>
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#include <linux/preempt.h>
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#include <linux/types.h>
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#include <asm/neon.h>
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static __must_check inline bool may_use_simd(void)
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{
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return IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && !in_hardirq()
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&& !irqs_disabled();
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}
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DEFINE_LOCK_GUARD_0(ksimd, kernel_neon_begin(), kernel_neon_end())
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#define scoped_ksimd() scoped_guard(ksimd)
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#endif /* _ASM_SIMD_H */