linux-kernel - Re: [ANNOUNCE] 3.0-rt4

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Date:	Thu, 28 Jul 2011 10:06:26 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Nikita V. Youshchenko" <yoush@...msu.su>
cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jason Wessel <jason.wessel@...driver.com>,
	lasaine@....cs.msu.su
Subject: Re: [ANNOUNCE] 3.0-rt4

On Thu, 28 Jul 2011, Nikita V. Youshchenko wrote:

> > The list of disabled config option is now:
> >
> >  - CONFIG_HIGHMEM [ see the mess it created in 33-rt ]
> 
> Could someone please point me to information on this?
> 
> In our setup, we do use PREEMPT_RT + HIGHMEM, on .33 for now (but want to 
> upgrade because of new hardware support issues with .33).  Up to now, we 
> did not face any issues related to PREEMPT_RT + HIGHMEM combination.

Yes, it works in 33-rt, but the way it's implemented is a horrible
hack. I had not enough capacity to implement that cleanly for 3.0-rt,
so I simply dropped it for now. The preliminary patches are there
(mainly distangling the disable_pagefault logic), so it should not be
that hard.

Thanks,

	tglx
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