linux-kernel - Re: ARM: vmsplit 4g/4g

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Date:   Mon, 15 Jun 2020 11:11:04 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     afzal mohammed <afzal.mohd.ma@...il.com>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: ARM: vmsplit 4g/4g

Hi Afzal!

On Fri, Jun 12, 2020 at 12:25 PM afzal mohammed <afzal.mohd.ma@...il.com> wrote:

> > > Note that this was done on a topic branch for user copy. Changes for
> > > kernel static mapping to vmalloc has not been merged with these.
> > > Also having kernel lowmem w/ a separate asid & switching at kernel
> > > entry/exit b/n user & kernel lowmem by changing ttbr0 is yet to be
> > > done. Quite a few things remaining to be done to achieve vmsplit 4g/4g
> >
> > I will be very excited to look at patches or a git branch once you have
> > something you want to show. Also to just understand how you go about
> > this.
>
> Don't put too much expectation on me, this is more of a learning for
> me. For user copy, the baby steps has been posted (To'ed you). On the
> static kernel mapping on vmalloc front, i do not want to post the
> patches in the current shape, though git-ized, will result in me
> getting mercilessly thrashed in public :). Many of the other platforms
> would fail and is not multi-platform friendly. i do not yet have a
> public git branch, i can send you the (ugly) patches separately, just
> let me know.

OK I would be very happy to look at it so I can learn a bit about the
hands-on and general approach here. Just send it to this address
directly and I will look!

My interest is mainly to see this progress so any way I can help or
tinker I'm happy to do. You can just incorporate my contributions if
any, I don't care much about code authorship and such things, it
just makes things more complex.

> If you would like, we can work together, at the same time keep in mind
> that me spending time on it would be intermittent & erratic (though i
> am trying to keep a consistent, but slow pace) perhaps making it
> difficult to coordinate. Or else i will continue the same way & request
> your help when required.
>
> For the next 3 weeks, right now, i cannot say whether i would be able
> to spend time on it, perhaps might be possible, but only during that
> time i will know.

I'm going for vacation the next 2 weeks or so, but then it'd be great if
we can start looking at this in-depth!

Thanks!
Linus Walleij