[PATCH] RISC-V: Add conditional macro for boot_sec_cpu

[Zong Li]

Fix link error when disable support SMP.
It causes the undefined reference to `smp_callin'.

Signed-off-by: Zong Li <z...@andestech.com>
---
 arch/riscv/kernel/head.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 3b6293f10e3e..396ec7b349ce 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -152,6 +152,7 @@ END(_start)
 .section .text
 .global boot_sec_cpu
 
+#ifdef CONFIG_HOTPLUG_CPU
 boot_sec_cpu:
        /* clear all pending flags */
        csrw sip, zero
@@ -160,6 +161,7 @@ boot_sec_cpu:
        fence
 
        tail smp_callin
+#endif
 
 __PAGE_ALIGNED_BSS
        /* Empty zero page */
-- 
2.16.1