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

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Message-ID: <1427251080.3459.8.camel@gmail.com>
Date:	Wed, 25 Mar 2015 03:38:00 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>,
	Steven Rostedt <rostedt@...dmis.org>,
	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>,
	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 Tue, 2015-03-24 at 19:15 +0100, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2015-03-21 19:02:23 [+0100]:
> 
> >> 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.
> >
> >Why can't we just Let swapper be the owner when in irq with no dummy?
> 
> so you abuse the owner to be swapper and mask it out everywhere. It does
> not look like a final solution. I'm more inclined to take you other
> patch. In the end I hope we get a timer re-work and do not need any
> hackary around it…

Yeah, it was just _a_ way to dodge the bullet.

	-Mike

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