linux-kernel - Re: [patch V2 14/52] x86/fpu: Make copy_xstate_to_kernel() usable for [x]fpregs

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Date:   Wed, 16 Jun 2021 18:13:38 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [patch V2 14/52] x86/fpu: Make copy_xstate_to_kernel() usable
 for [x]fpregs_get()

On Mon, Jun 14, 2021 at 05:44:22PM +0200, Thomas Gleixner wrote:
> When xsave with init state optimiziation is used then a component's state

				optimization

> @@ -1062,14 +1062,20 @@ static void copy_feature(bool from_xstat
>  	membuf_write(to, from_xstate ? xstate : init_xstate, size);
>  }
>  
> -/*
> - * Convert from kernel XSAVE or XSAVES compacted format to UABI
> - * non-compacted format and copy to a kernel-space ptrace buffer.
> +/**
> + * copy_uabi_xstate_to_membuf - Copy kernel saved xstate to a UABI buffer

If this is what it does, then the function should be called:

copy_xstate_to_uabi_buf()

or so.

"membuf" is only an implementation detail anyway. IMHO.

Thx.

-- 
Regards/Gruss,
    Boris.

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