linux-kernel - Re: [PATCH 1/3] riscv: Add support for kernel-mode FPU

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Date:   Thu, 7 Dec 2023 22:17:01 -0600
From:   Samuel Holland <samuel.holland@...ive.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...il.com>,
        Christian König <christian.koenig@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Pan Xinhui <Xinhui.Pan@....com>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org
Subject: Re: [PATCH 1/3] riscv: Add support for kernel-mode FPU

Hi Christoph,

On 2023-11-22 2:33 AM, Christoph Hellwig wrote:
> On Tue, Nov 21, 2023 at 07:05:13PM -0800, Samuel Holland wrote:
>> +static inline void kernel_fpu_begin(void)
>> +{
>> +	preempt_disable();
>> +	fstate_save(current, task_pt_regs(current));
>> +	csr_set(CSR_SSTATUS, SR_FS);
>> +}
>> +
>> +static inline void kernel_fpu_end(void)
>> +{
>> +	csr_clear(CSR_SSTATUS, SR_FS);
>> +	fstate_restore(current, task_pt_regs(current));
>> +	preempt_enable();
>> +}
> 
> Is there any critical reason to inline these two?  I'd much rather see
> them out of line and exported instead of the low-level helpers.

No, I will define them out of line in v2.

Regards,
Samuel