Message-ID: <0c989754-5a8e-72d8-d489-11ed364b91cc@xen0n.name>
Date:   Mon, 6 Mar 2023 20:35:07 +0800
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0)
 Gecko/20100101 Thunderbird/102.8.0
Subject: Re: [PATCH V3] LoongArch: Provide kernel fpu functions
Content-Language: en-US
To:     maobibo <maobibo@loongson.cn>,
        Huacai Chen <chenhuacai@loongson.cn>,
        Arnd Bergmann <arnd@arndb.de>,
        Huacai Chen <chenhuacai@kernel.org>
Cc:     loongarch@lists.linux.dev, linux-arch@vger.kernel.org,
        Xuefeng Li <lixuefeng@loongson.cn>,
        Guo Ren <guoren@kernel.org>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn
References: <20230306095934.609589-1-chenhuacai@loongson.cn>
 <029a5993-b993-ab73-0a14-0df9b0ddf3da@loongson.cn>
From:   WANG Xuerui <kernel@xen0n.name>
In-Reply-To: <029a5993-b993-ab73-0a14-0df9b0ddf3da@loongson.cn>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk

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/