linux-kernel - Re: [PATCH V4 2/2] rcu: Update jiffies in rcu_cpu_stall

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Message-ID: <87il94dbjt.ffs@tglx>
Date:   Thu, 24 Aug 2023 11:39:18 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     Joel Fernandes <joel@...lfernandes.org>,
        Z qiang <qiang.zhang1211@...il.com>, paulmck@...nel.org,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Josh Triplett <josh@...htriplett.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        John Stultz <jstultz@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Binbin Zhou <zhoubinbin@...ngson.cn>
Subject: Re: [PATCH V4 2/2] rcu: Update jiffies in rcu_cpu_stall_reset()

On Thu, Aug 24 2023 at 10:47, Huacai Chen wrote:
> On Thu, Aug 24, 2023 at 6:03 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>> +unsigned long tick_estimate_stale_jiffies(void)
>> +{
>> +       ktime_t delta = ktime_get_mono_fast_ns() - READ_ONCE(last_jiffies_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.