Re: [tip: x86/fpu] x86/fpu: Deactivate FPU state after failure during state load

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Subject: Re: [tip: x86/fpu] x86/fpu: Deactivate FPU state after failure during state load
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Wed, 8 Jan 2020 12:46:51 +0100
Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx, Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, "Ravi V. Shankar" <ravi.v.shankar@xxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, x86-ml <x86@xxxxxxxxxx>
In-reply-to: <FA0D2929-63D0-4473-A492-42227D7A5D98@amacapital.net>
References: <157840155965.30329.313988118654552721.tip-bot2@tip-bot2> <FA0D2929-63D0-4473-A492-42227D7A5D98@amacapital.net>
User-agent: Mutt/1.10.1 (2018-07-13)

On Tue, Jan 07, 2020 at 10:41:52AM -1000, Andy Lutomirski wrote:
> Wow, __fpu__restore_sig is a mess.

FWIW, I share your sentiment and I'd very much take patches which
simplify that flow. It is causing me headaches each time I have to look
at it.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

References:
- [tip: x86/fpu] x86/fpu: Deactivate FPU state after failure during state load
  - From: tip-bot2 for Sebastian Andrzej Siewior
- Re: [tip: x86/fpu] x86/fpu: Deactivate FPU state after failure during state load
  - From: Andy Lutomirski

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