[PATCH 1/2] ARM: make virt_to_idmap() return unsigned long

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Wed, Feb 03, 2016 at 10:43:23AM -0500, Vitaly Andrianov wrote:
> >100%. I came up with absolutely similar fix.
> >
> >
> >Regarding, kexec:
> >- it seems can't be tested on ks2 out of the box, because there is unmet dependency in kconfig
> >  config KEXEC
> >         bool "Kexec system call (EXPERIMENTAL)"
> >-       depends on (!SMP || PM_SLEEP_SMP)
> >         depends on !CPU_V7M
> >         select KEXEC_CORE
> >         help
> >
> >- any way, i've hacked kernel as above;
> >- downloaded and built kexec-tools
> >git://git.kernel.org/pub/scm/linux/kernel/git/geoff/kexec-tools.git
> >- tried to run it using different combination of parameters, but always
> >with below result:
> ># kexec -l /boot/zImage
> >kexec version: 15.12.22.16.38-g6503cb3
> >Could not find a free area of memory of 0x3b2ca0 bytes...
> >Cannot load /boot/zImage
> >
> >I'm doing something wrong, but don't know what yet :(
> >- these patches were not applied, I'd like to see kexec not working first
> >
> >
> I'm not sure about that particular issue, but when I worked on KS2 kexec I
> had to patch kexec-tools to support KS2 LPAE memory.

This was specifically for Vitaly to test, as he has patches to work
around most of the KS2 issues with kexec (although I have a KS2, I
don't have everything that's necessary to get a working kexec in
place.)

What I do want to know is whether this patch makes Vitaly's kexec
patch smaller, and most importantly, what's left to deal with - in
other words, I'd like to see the kernel patch for what's remaining.

Alternatively, if I can have both the kernel and userland patches
so I can get a working kexec setup here, that may be a better way
forward.

Either way, I think I'm going to push these patches out into
linux-next very soon, because I believe that they're the correct
approach to solving some of the issues found in Vitaly's original
patch, unless someone discovers that they're broken in some manner.

-- 
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