From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [ANNOUNCE] 3.0-rt4
Date: Thu, 28 Jul 2011 10:06:26 +0200 (CEST)
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References: <alpine.LFD.2.02.1107272222420.2660@ionos> <201107281133.09107@zigzag.lvk.cs.msu.su>
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Cc: LKML <linux-kernel@vger.kernel.org>,
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	Peter Zijlstra <peterz@infradead.org>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Jason Wessel <jason.wessel@windriver.com>,
	lasaine@lvk.cs.msu.su
To: "Nikita V. Youshchenko" <yoush@cs.msu.su>
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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