linux-kernel - Re: x86/pti: smp_processor_id() called while preemptible in resume-from-sleep

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Message-ID: <CA+55aFypbpi+E2fMfB-C8k+a+Zj+Q6KMBjgHiwC0VOP=o44ScQ@mail.gmail.com>
Date:   Sat, 30 Dec 2017 12:00:25 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Dominik Brodowski <linux@...inikbrodowski.net>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: x86/pti: smp_processor_id() called while preemptible in resume-from-sleep

On Sat, Dec 30, 2017 at 11:41 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>
> That pagetable fiddling dissappeared long ago, but the flush stayed around
> forever.

Yes, so it all makes sense, and those two tlb invalidates should just
be removed.

Good to have the reason for the left-over code understood.

            Linus