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

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Date:   Wed, 23 Aug 2023 23:41:50 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Alan Huang <mmpgouride@...il.com>,
        Huacai Chen <chenhuacai@...nel.org>
Cc:     Z qiang <qiang.zhang1211@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        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 Wed, Aug 16 2023 at 23:56, Alan Huang wrote:
>> If  do_update_jiffies_64() cannot be used in NMI context, can we
>
> What about updating jiffies in dbg_touch_watchdogs or adding a wrapper which updates
> both jiffies and jiffies_stall?

What makes dbg_touch_watchdogs() any different?

KGDB can pretty much have a breakpoint everywhere and therefore also
within the jiffies lock held region.

Thanks,

        tglx