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

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Message-ID: <ZV283NfE/K5zLXDD@infradead.org>
Date:   Wed, 22 Nov 2023 00:33:32 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Samuel Holland <samuel.holland@...ive.com>
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

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.