[PATCH v5 2/6] arm64: Introduce VA_BITS and translation level options
jays.lee at samsung.com
Tue May 6 20:59:12 PDT 2014
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.
- Jungseok Lee
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