powerpc/hugetlb: Replace __get_cpu_var with get_cpu_var
Replace __get_cpu_var safely with get_cpu_var to avoid
the following call trace:
[ 7253.637591] BUG: using smp_processor_id() in preemptible [
00000000 00000000]
code: hugemmap01/9048
[ 7253.637601] caller is free_hugepd_range.constprop.25+0x88/0x1a8
[ 7253.637605] CPU: 1 PID: 9048 Comm: hugemmap01 Not tainted 3.10.20-rt14+ #114
[ 7253.637606] Call Trace:
[ 7253.637617] [
cb049d80] [
c0007ea4] show_stack+0x4c/0x168 (unreliable)
[ 7253.637624] [
cb049dc0] [
c031c674] debug_smp_processor_id+0x114/0x134
[ 7253.637628] [
cb049de0] [
c0016d28] free_hugepd_range.constprop.25+0x88/0x1a8
[ 7253.637632] [
cb049e00] [
c001711c] hugetlb_free_pgd_range+0x6c/0x168
[ 7253.637639] [
cb049e40] [
c0117408] free_pgtables+0x12c/0x150
[ 7253.637646] [
cb049e70] [
c011ce38] unmap_region+0xa0/0x11c
[ 7253.637671] [
cb049ef0] [
c011f03c] do_munmap+0x224/0x3bc
[ 7253.637676] [
cb049f20] [
c011f2e0] vm_munmap+0x38/0x5c
[ 7253.637682] [
cb049f40] [
c000ef88] ret_from_syscall+0x0/0x3c
[ 7253.637686] --- Exception: c01 at 0xff16004
Signed-off-by: Tiejun Chen<tiejun.chen@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>