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

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Date:	Thu, 28 Jul 2011 11:37:46 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Nikita V. Youshchenko" <yoush@...msu.su>
cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.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:

> > On Thu, 2011-07-28 at 12:24 +0400, Nikita V. Youshchenko wrote:
> > > (*) we need >1G of memory for data buffers, and have too much legacy
> > > software components so moving to 64bit system is not practical within
> > > available resource
> >
> > You can run a complete 32bit userspace on a 64bit kernel without any
> > problems.
> 
> ... expect shared data between kernel and userspace (structures passed over 
> ioctl()s, structures in mmapped buffers). Unfortunately, in scope of our 
> project (that lasts since 2001 or so), we do have such issues :(.

Aside of that being horrid, it's trivial to solve with proper data
types. u32 and friends are there for a reason. But feel free to get
the highmem thing working again :)

Thanks,

	tglx

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