[PATCH -next] powerpc/book3s64: fix link error with CONFIG_PPC_RADIX_MMU=n

[Yang Yingliang]

Fix link error when CONFIG_PPC_RADIX_MMU is disabled:
powerpc64-linux-gnu-ld: arch/powerpc/platforms/pseries/lpar.o:(.toc+0x0): 
undefined reference to `mmu_pid_bits'

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Yang Yingliang <yangyingli...@huawei.com>
---
 arch/powerpc/mm/book3s64/mmu_context.c | 4 ++++
 arch/powerpc/platforms/pseries/lpar.c  | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/arch/powerpc/mm/book3s64/mmu_context.c 
b/arch/powerpc/mm/book3s64/mmu_context.c
index 0ba30b8b935b..a8e292cd88f0 100644
--- a/arch/powerpc/mm/book3s64/mmu_context.c
+++ b/arch/powerpc/mm/book3s64/mmu_context.c
@@ -152,6 +152,7 @@ void hash__setup_new_exec(void)
 
 static int radix__init_new_context(struct mm_struct *mm)
 {
+#ifdef CONFIG_PPC_RADIX_MMU
        unsigned long rts_field;
        int index, max_id;
 
@@ -177,6 +178,9 @@ static int radix__init_new_context(struct mm_struct *mm)
        mm->context.hash_context = NULL;
 
        return index;
+#else
+       return -ENOTSUPP;
+#endif
 }
 
 int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
diff --git a/arch/powerpc/platforms/pseries/lpar.c 
b/arch/powerpc/platforms/pseries/lpar.c
index baf24eacd268..e454e218dbba 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -1726,10 +1726,12 @@ void __init hpte_init_pseries(void)
 
 void radix_init_pseries(void)
 {
+#ifdef CONFIG_PPC_RADIX_MMU
        pr_info("Using radix MMU under hypervisor\n");
 
        pseries_lpar_register_process_table(__pa(process_tb),
                                                0, PRTB_SIZE_SHIFT - 12);
+#endif
 }
 
 #ifdef CONFIG_PPC_SMLPAR
-- 
2.25.1