linux-kernel - Re: [PATCH v2 07/14] LoongArch: Implement ARCH_HAS_KERNEL_FPU

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Message-ID: <ZZvCPMcYq6KBs7ND@infradead.org>
Date: Mon, 8 Jan 2024 01:37:00 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: Samuel Holland <samuel.holland@...ive.com>,
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
	x86@...nel.org, linux-riscv@...ts.infradead.org,
	Christoph Hellwig <hch@....de>, loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
	linux-arch@...r.kernel.org, WANG Xuerui <git@...0n.name>
Subject: Re: [PATCH v2 07/14] LoongArch: Implement ARCH_HAS_KERNEL_FPU_SUPPORT

On Sun, Jan 07, 2024 at 10:39:07AM +0800, Huacai Chen wrote:
> > Do you mean that LoongArch32 does not support double-precision FP in hardware?
> > At least both of the consumers in this series use double-precision, so my first
> > thought is that LoongArch32 could not select ARCH_HAS_KERNEL_FPU_SUPPORT.
> Then is it possible to introduce CC_FLAGS_SP_FPU and CC_FLAGS_DP_FPU?
> I think there may be some place where SP FP is enough.

Let's defer that until it is actually neeed.