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Date:   Sat, 16 May 2020 09:35:57 +0200
From:   Arnd Bergmann <>
To:     afzal mohammed <>
Cc:     Russell King <>,
        Linux ARM <>,
        "" <>
Subject: Re: ARM: static kernel in vmalloc space

On Sat, May 16, 2020 at 8:06 AM afzal mohammed <> wrote:
> On Thu, May 14, 2020 at 05:32:41PM +0200, Arnd Bergmann wrote:
> > Typical distros currently offer two kernels, with and without LPAE,
> > and they probably don't want to add a third one for LPAE with
> > either highmem or vmsplit-4g-4g. Having extra user address
> > space and more lowmem is both going to help users that
> > still have 8GB configurations.
> Okay, so the conclusion i take is,
> 1. VMSPLIT 4G/4G have to live alongside highmem
> 2. For user space copy, do pinning followed by kmap

Right, though kmap_atomic() should be sufficient here
because it is always a short-lived mapping.


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