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Date: Mon, 11 Dec 2023 08:11:24 -0800
From: Christoph Hellwig <hch@infradead.org>
To: Samuel Holland <samuel.holland@sifive.com>
Cc: linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
	linuxppc-dev@lists.ozlabs.org, x86@kernel.org,
	linux-riscv@lists.infradead.org,
	Christoph Hellwig <hch@infradead.org>, linux-kernel@vger.kernel.org,
	amd-gfx@lists.freedesktop.org, linux-arch@vger.kernel.org
Subject: Re: [RFC PATCH 09/12] riscv: Add support for kernel-mode FPU
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References: <20231208055501.2916202-1-samuel.holland@sifive.com>
 <20231208055501.2916202-10-samuel.holland@sifive.com>
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> +#ifdef __riscv_f
> +
> +#define kernel_fpu_begin() \
> +	static_assert(false, "floating-point code must use a separate translation unit")
> +#define kernel_fpu_end() kernel_fpu_begin()
> +
> +#else
> +
> +void kernel_fpu_begin(void);
> +void kernel_fpu_end(void);
> +
> +#endif

I'll assume this is related to trick that places code in a separate
translation unit, but I fail to understand it.  Can you add a comment
explaining it?