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From: luferry <luferry@163.com>
To: "Thomas Gleixner" <tglx@linutronix.de>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>,
	"Rik van Riel" <riel@surriel.com>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Josh Poimboeuf" <jpoimboe@redhat.com>,
	linux-kernel@vger.kernel.org
Subject: Re:Re: [PATCH v2] smp: avoid generic_exec_single cause system lockup
Date: Thu, 18 Jul 2019 16:50:52 +0800 (CST)	[thread overview]
Message-ID: <5f5fbd7.1073c.16c0446ea63.Coremail.luferry@163.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1907181007340.1778@nanos.tec.linutronix.de>











At 2019-07-18 16:07:58, "Thomas Gleixner" <tglx@linutronix.de> wrote:
>On Thu, 18 Jul 2019, luferry@163.com wrote:
>
>> From: luferry <luferry@163.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.

  reply	other threads:[~2019-07-18  9:06 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-18  8:03 luferry
2019-07-18  8:07 ` Thomas Gleixner
2019-07-18  8:50   ` luferry [this message]
2019-07-18  9:58     ` Thomas Gleixner
2019-07-18 16:06       ` Peter Zijlstra
2019-07-18 18:17         ` Thomas Gleixner
2019-07-20  9:31         ` [tip:smp/urgent] smp: Warn on function calls from softirq context tip-bot for Peter Zijlstra

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