linux-kernel - Re: [GIT pull] locking/urgent for v5.10-rc6

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Message-ID: <20201201073906.GP2414@hirez.programming.kicks-ass.net>
Date:   Tue, 1 Dec 2020 08:39:06 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [GIT pull] locking/urgent for v5.10-rc6

On Mon, Nov 30, 2020 at 09:55:44AM -0800, Linus Torvalds wrote:

> Yes, yes, I can very well imagine some hardware doing a "idle until
> you sense an interrupt, but don't actually take it". It's not
> _impossible_. But it's certainly not normal.

A lot of hardware actually does that, including modern x86. But yes, not
nearly everything.