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From:   Thomas Gleixner <tglx@linutronix.de>
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To:     Huacai Chen <chenhuacai@kernel.org>
Cc:     Joel Fernandes <joel@joelfernandes.org>,
        Z qiang <qiang.zhang1211@gmail.com>, paulmck@kernel.org,
        Huacai Chen <chenhuacai@loongson.cn>,
        Frederic Weisbecker <frederic@kernel.org>,
        Neeraj Upadhyay <quic_neeraju@quicinc.com>,
        Josh Triplett <josh@joshtriplett.org>,
        Boqun Feng <boqun.feng@gmail.com>,
        Ingo Molnar <mingo@kernel.org>,
        John Stultz <jstultz@google.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        rcu@vger.kernel.org, linux-kernel@vger.kernel.org,
        stable@vger.kernel.org, Binbin Zhou <zhoubinbin@loongson.cn>
Subject: Re: [PATCH V4 2/2] rcu: Update jiffies in rcu_cpu_stall_reset()
In-Reply-To: <CAAhV-H7o+SK__ySWQRkbB4B-LTBFS-ryosqH_r53ZrZ+W1ZE-A@mail.gmail.com>
References: <CAAhV-H6ejw=8afS0jmmQvKUrCw=qZm_P6SA0A+tuvvb8bsq4-Q@mail.gmail.com>
 <5777BD82-2C8D-4BAB-BDD3-C2C003DC57FB@joelfernandes.org>
 <CAAhV-H58OpQJapV7LDNjZ-vM7nNJrwdkBiPjFcCutO1yRsUshQ@mail.gmail.com>
 <87ttspct76.ffs@tglx>
 <CAAhV-H7o+SK__ySWQRkbB4B-LTBFS-ryosqH_r53ZrZ+W1ZE-A@mail.gmail.com>
Date:   Thu, 24 Aug 2023 11:39:18 +0200
Message-ID: <87il94dbjt.ffs@tglx>
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On Thu, Aug 24 2023 at 10:47, Huacai Chen wrote:
> On Thu, Aug 24, 2023 at 6:03=E2=80=AFAM Thomas Gleixner <tglx@linutronix.=
de> wrote:
>> +unsigned long tick_estimate_stale_jiffies(void)
>> +{
>> +       ktime_t delta =3D ktime_get_mono_fast_ns() - READ_ONCE(last_jiff=
ies_update);
>> +
>> +       return delta < 0 ? 0 : div_s64(delta, TICK_NSEC);
>> +}
>> +
>>  /*
>>   * Must be called with interrupts disabled !
>>   */
> Thank you for your advice, now the latest proposal is here [1], this
> is very similar to your diff, please take a look.

Similar by some definition of similar.