MIPS: paravirt: Fix undefined reference to smp_bootstrap

If the paravirt machine is compiles without CONFIG_SMP, the following
linker error occurs

arch/mips/kernel/head.o: In function `kernel_entry':
(.ref.text+0x10): undefined reference to `smp_bootstrap'

due to the kernel entry macro always including SMP startup code.
Wrap this code in CONFIG_SMP to fix the error.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # 3.16+
Patchwork: https://patchwork.linux-mips.org/patch/14212/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h b/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
index 2f82bfa3a773..c9f5769dfc8f 100644
--- a/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
+++ b/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
@@ -11,11 +11,13 @@
 #define CP0_EBASE $15, 1
 
         .macro  kernel_entry_setup
+#ifdef CONFIG_SMP
         mfc0    t0, CP0_EBASE
         andi    t0, t0, 0x3ff           # CPUNum
         beqz    t0, 1f
         # CPUs other than zero goto smp_bootstrap
         j       smp_bootstrap
+#endif /* CONFIG_SMP */
 
 1:
         .endm