linux-kernel - Re: [PATCH RT 2/4] Revert "timers: do not raise softirq unconditionally"

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Message-ID: <550AFC6A.4050901@hp.com>
Date:	Thu, 19 Mar 2015 10:42:18 -0600
From:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Mike Galbraith <umgwanakikbuti@...il.com>
CC:	linux-kernel@...r.kernel.org,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Carsten Emde <C.Emde@...dl.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	John Kacur <jkacur@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [PATCH RT 2/4] Revert "timers: do not raise softirq unconditionally"


On 03/19/2015 10:26 AM, Steven Rostedt wrote:
> On Thu, 19 Mar 2015 09:17:09 +0100
> Mike Galbraith <umgwanakikbuti@...il.com> wrote:
> 
> 
>> (aw crap, let's go shopping)... so why is the one in timer.c ok?
> 
> It's not. Sebastian, you said there were no other cases of rt_mutexes
> being taken in hard irq context. Looks like timer.c has one.
> 
> So perhaps the real fix is to get that special case of ownership in
> hard interrupt context?
> 
> -- Steve
> 

Steve, I'm still working on the fix we discussed using dummy irq_task.
I should be able to submit some time next week, if still interested.

Either that, or I think we should remove the function
spin_do_trylock_in_interrupt() to prevent any possibility of running
into similar problems in the future.

Thanks,
Mak.


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