linux-kernel - Re: [PATCH V3] LoongArch: Provide kernel fpu functions

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Message-ID: <0c989754-5a8e-72d8-d489-11ed364b91cc@xen0n.name>
Date:   Mon, 6 Mar 2023 20:35:07 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     maobibo <maobibo@...ngson.cn>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Arnd Bergmann <arnd@...db.de>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     loongarch@...ts.linux.dev, linux-arch@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH V3] LoongArch: Provide kernel fpu functions

Hi,

On 2023/3/6 20:03, maobibo wrote:
> 
> 
> 在 2023/3/6 17:59, Huacai Chen 写道:
>> Provide kernel_fpu_begin()/kernel_fpu_end() to allow the kernel itself
>> to use fpu. They can be used by some other kernel components, e.g., the
>> AMDGPU graphic driver for DCN.
> Since kernel is compiled with -msoft-float, I guess hw fpu will not be
> used in kernel by present:). However it is deserved to try.

This has been explained by Ruoyao, but we'd need such support anyway 
when we have LSX/LASX support mainlined in the future and want to 
accelerate various algorithms with those instructions. Maybe at that 
time you'll want to port some of those too ;-)

-- 
WANG "xen0n" Xuerui

Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/