kernel compilation failure on power7 system

[CAI Qian]

Stable kernel 3.7.1 failure to compile on power7 system here,

arch/powerpc/kvm/built-in.o: In function `hdec_soon':
/root/linux-stable/arch/powerpc/kvm/book3s_hv_rmhandlers.S:1068: 
undefined reference to `PACA_SPRG3'
make: *** [vmlinux] Error 1

reverted this commit fixed the problem,
-----
0127262c01f0beb485f917c720d1d95d165dfdbf
[PATCH] powerpc: Restore VDSO information on critical exception om
 BookE

Critical exception on 64-bit booke uses user-visible SPRG3 as scratch.
Restore VDSO information in SPRG3 on exception prolog.

Use a common sprg3 field in PACA for all powerpc64 architectures.
-----

Used this config - http://people.redhat.com/qcai/stable/config-ppc

system information here,
# cat /proc/device-tree/model
IBM,8231-E2B

CAI Qian
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