linux-kernel - Re: [patch 1/3] timekeeping: Annotate ktime_get_boot_fast_ns() with data

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Message-ID: <YllgHEhwDOYqv5IX@hirez.programming.kicks-ass.net>
Date:   Fri, 15 Apr 2022 14:07:56 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [patch 1/3] timekeeping: Annotate ktime_get_boot_fast_ns() with
 data_race()

On Fri, Apr 15, 2022 at 11:19:35AM +0200, Thomas Gleixner wrote:
> Accessing timekeeper::offset_boot in ktime_get_boot_fast_ns() is an
> intended data race as the reader side cannot synchronize with a writer and
> there is no space in struct tk_read_base of the NMI safe timekeeper.
> 
> Mark it so.

If offs_boot actually ever changed?