linux-kernel - Re: [PATCH v5 2/6] arm64: Introduce VA

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Message-id: <001b01cf69a8$b49e5010$1ddaf030$@samsung.com>
Date:	Wed, 07 May 2014 12:59:12 +0900
From:	Jungseok Lee <jays.lee@...sung.com>
To:	'Christoffer Dall' <christoffer.dall@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	Catalin.Marinas@....com, 'Marc Zyngier' <Marc.Zyngier@....com>,
	linux-kernel@...r.kernel.org,
	'linux-samsung-soc' <linux-samsung-soc@...r.kernel.org>,
	steve.capper@...aro.org, sungjinn.chung@...sung.com,
	'Arnd Bergmann' <arnd@...db.de>, kgene.kim@...sung.com,
	ilho215.lee@...sung.com
Subject: Re: [PATCH v5 2/6] arm64: Introduce VA_BITS and translation level
 options

On Friday, May 02, 2014 8:17 PM, Christoffer Dall wrote:
> On Fri, May 02, 2014 at 10:57:09AM +0900, Jungseok Lee wrote:
> > On Thursday, May 01, 2014 7:06 PM, Christoffer Dall wrote:
> > > On Thu, May 01, 2014 at 11:33:56AM +0900, Jungseok Lee wrote:
> 
> [...]
> 
> > > > +
> > > > +choice
> > > > +	prompt "Virtual address space size"
> > > > +	default ARM64_VA_BITS_39 if ARM64_4K_PAGES
> > > > +	default ARM64_VA_BITS_42 if ARM64_64K_PAGES
> > > > +	help
> > > > +	  Allows virtual address space size. A level of translation
> > > > +tables
> > >
> > > What does "Allows virtual address space size" mean exactly?
> >
> > It means that VA space size can be chosen. For example, there are two
> > VA size options, 39-bit and 48-bit, with 4KB pages. If 39-bit VA space
> > is not enough, 48-bit can be selected instead. The 5th patch adds a
> > 48-bit option to this choice blocks.
> >
> > If 16KB pages are supported with both 47-bit and 48-bit VA size,
> > people could configure it in menuconfig.
> >
> > In this context, I've written it down like page size.
> >
> > I think Catalin's comment would be helpful.
> > http://www.spinics.net/linux/lists/arm-kernel/msg319552.html
> >
> I didn't have problems understanding the concept, I was questioning the language.  The way it is
> written now it suggests having a virtual address space size, as opposed to not having a size at all,
> which doesn't make sense.
> 
> I think you want to say something along the lines of "Allows choosing a virtual address space size",
> or "Allows choosing one of multiple possible virtual address space sizes".

Ahh... I see. I will revise the sentence clearly.
Thanks!

- Jungseok Lee

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