linux-kernel - Re: [GIT PULL] x86 fixes

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Message-ID: <CAHk-=wi_Uc6uFAXRa+3PAi0eRpu0Uw5v40VjKTj3B21VbOd1rg@mail.gmail.com>
Date:   Sun, 11 Oct 2020 11:00:37 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86 fixes

On Sun, Oct 11, 2020 at 1:09 AM Ingo Molnar <mingo@...nel.org> wrote:
>
>  - Fix a (hopefully final) IRQ state tracking bug vs. MCE handling

Why is the nmi_enter/nmi_exit thing not a problem on non-x86 architectures?

Put another way: x86 does extra work to track IRQ state across NMI.
What makes x86 special? It _feels_ to me like everybody should do
that? No?

Please tell me what I've missed..

                   Linus