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SubjectRe: 2.6.22-rc4-mm2: kvm compile breakage with X86_CMPXCHG64=n
Adrian Bunk wrote:
> On Wed, Jun 06, 2007 at 10:03:13PM -0700, Andrew Morton wrote:
>
>> ...
>> Changes since 2.6.22-rc4-mm1:
>> ...
>> git-kvm.patch
>> ...
>> git trees
>> ...
>>
>
> I'm getting the following compile error with CONFIG_X86_CMPXCHG64=n
> (with -Werror-implicit-function-declaration - otherwise it would be a
> link error):
>
> <-- snip -->
>
> ...
> CC [M] drivers/kvm/mmu.o
> /home/bunk/linux/kernel-2.6/linux-2.6.22-rc4-mm2/drivers/kvm/mmu.c: In function ‘set_shadow_pte’:
> /home/bunk/linux/kernel-2.6/linux-2.6.22-rc4-mm2/drivers/kvm/mmu.c:199: error: implicit declaration of function ‘set_64bit’
> make[3]: *** [drivers/kvm/mmu.o] Error 1
>
> <-- snip -->
>

I've committed the following, which should disable kvm on i486 and below:

diff --git a/drivers/kvm/Kconfig b/drivers/kvm/Kconfig
index 2f661e5..33fa28a 100644
--- a/drivers/kvm/Kconfig
+++ b/drivers/kvm/Kconfig
@@ -11,6 +11,7 @@ if VIRTUALIZATION
config KVM
tristate "Kernel-based Virtual Machine (KVM) support"
depends on X86 && EXPERIMENTAL
+ depends on X86_CMPXCHG64 || 64BIT
---help---
Support hosting fully virtualized guest machines using hardware
virtualization extensions. You will need a fairly recent

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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