linux-kernel - Re:Re: [PATCH v2] smp: avoid generic_exec

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Message-ID: <5f5fbd7.1073c.16c0446ea63.Coremail.luferry@163.com>
Date:   Thu, 18 Jul 2019 16:50:52 +0800 (CST)
From:   luferry <luferry@....com>
To:     "Thomas Gleixner" <tglx@...utronix.de>
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Rik van Riel" <riel@...riel.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Josh Poimboeuf" <jpoimboe@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH v2] smp: avoid generic_exec_single cause system
 lockup

At 2019-07-18 16:07:58, "Thomas Gleixner" <tglx@...utronix.de> wrote:
>On Thu, 18 Jul 2019, luferry@....com wrote:
>
>> From: luferry <luferry@....com>
>> 
>> The race can reproduced by sending wait enabled IPI in softirq/irq env
>
>Which code path is doing that?
>
>Thanks,
>
>	tglx

Thanks for your kindly reply.
I checked kernel and found no code path can run into this.
Actually , i encounter with this problem by my own code.
I need to do some specific urgent work periodicity and these 
work may run for quite a while. So i can't disable irq during these work 
which stops me from using hrtimer to do this. So i did add an extra 
sofitrq action which may invoke smp_call.