linux-kernel - Re: Overlapping ioremap() calls, set_memory

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Message-ID: <20160305114229.GB7259@gmail.com>
Date:	Sat, 5 Mar 2016 12:42:29 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:	Toshi Kani <toshi.kani@....com>, Toshi Kani <toshi.kani@...com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Dave Airlie <airlied@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, X86 ML <x86@...nel.org>,
	Daniel Vetter <daniel.vetter@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Brian Gerst <brgerst@...il.com>,
	Dennis Dalessandro <dennis.dalessandro@...el.com>,
	Andy Walls <awalls@...metrocast.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: Overlapping ioremap() calls, set_memory_*() semantics


* Luis R. Rodriguez <mcgrof@...nel.org> wrote:

> On Fri, Mar 4, 2016 at 10:18 AM, Toshi Kani <toshi.kani@....com> wrote:
> > On Fri, 2016-03-04 at 10:44 +0100, Ingo Molnar wrote:
> >> * Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> >>
> >> Could you outline a specific case where it's done intentionally - and the
> >> purpose behind that intention?
> >
> > The term "overlapping" is a bit misleading.
> 
> To the driver author its overlapping, its overlapping on the physical address.

Guys please stop this crazy talk - when the same physical address is mapped to 
multiple virtual addresses is called 'aliasing' - the term 'overlapping' is used 
when memory ranges overlap ...

Thanks,

	Ingo