Possible regression in next-20150323 due to "ARM, arm64: kvm: get rid of the bounce page"

[Simon Horman]

On Thu, Mar 26, 2015 at 08:29:21AM -0700, Tyler Baker wrote:
> On 26 March 2015 at 06:36, Will Deacon <will.deacon at arm.com> wrote:
> > On Thu, Mar 26, 2015 at 12:39:39AM +0000, Simon Horman wrote:
> >> On Tue, Mar 24, 2015 at 11:13:58AM -0500, Nishanth Menon wrote:
> >> > I think we now have a new error: (seen with omap2plus_defconfig)
> >> > on next-20150324 :
> >> > ./arch/arm/kernel/vmlinux.lds:677: undefined symbol `__hyp_idmap_size'
> >> > referenced in expression
> >> > make: *** [vmlinux] Error 1
> >>
> >> Thanks, I am seeing that too.
> >>
> >> My armchair suggestion is that the following should be reverted.
> >>
> >> e60a1fec44a2f ("ARM: kvm: implement replacement for ld's LOG2CEIL()")
> >> 06f75a1f62000 ("ARM, arm64: kvm: get rid of the bounce page")
> >
> > Can you try again with the latest -next please? We've merged an additional
> > patch aimed at sorting this out. Reverting isn't really an option, as
> > there's an awful lot of code that depends on the bounce page removal.
> 
> Here are the kernelci.org -next results[1], if you click the build
> status you can dig down into the build failures. next-20150326 has now
> hit a compiler bug, Arnd mentioned he was looking into this issue.

I have confirmed that next-20150326 does not compile without
the following reverted:

12eb3e833961 ("ARM: kvm: assert on HYP section boundaries not actual code size")
e60a1fec44a2 ("ARM: kvm: implement replacement for ld's LOG2CEIL()")
06f75a1f6200 ("ARM, arm64: kvm: get rid of the bounce page")