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* [PATCH] RISC-V: Fix build warning for smpboot.c
@ 2020-07-30  0:25 Atish Patra
  0 siblings, 0 replies; only message in thread
From: Atish Patra @ 2020-07-30  0:25 UTC (permalink / raw)
  To: linux-kernel
  Cc: Albert Ou, Anup Patel, Atish Patra, Palmer Dabbelt,
	Paul Walmsley, linux-riscv

The following warnings are reported by kbuild with W=1.

>> arch/riscv/kernel/smpboot.c:109:5: warning: no previous prototype for
'start_secondary_cpu' [-Wmissing-prototypes]
     109 | int start_secondary_cpu(int cpu, struct task_struct *tidle)
         |     ^~~~~~~~~~~~~~~~~~~
   arch/riscv/kernel/smpboot.c:146:34: warning: no previous prototype for
'smp_callin' [-Wmissing-prototypes]
     146 | asmlinkage __visible void __init smp_callin(void)
         |                                  ^~~~~~~~~~

Fix the warnings by marking the local functions static and adding the prototype
for the global function.

Signed-off-by: Atish Patra <>
 arch/riscv/include/asm/smp.h | 3 +++
 arch/riscv/kernel/smpboot.c  | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
index 40bb1c15a731..6dfd2a1446d5 100644
--- a/arch/riscv/include/asm/smp.h
+++ b/arch/riscv/include/asm/smp.h
@@ -40,6 +40,9 @@ void arch_send_call_function_single_ipi(int cpu);
 int riscv_hartid_to_cpuid(int hartid);
 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
+/* Secondary hart entry */
+asmlinkage void smp_callin(void);
  * Obtains the hart ID of the currently executing task.  This relies on
  * THREAD_INFO_IN_TASK, but we define that unconditionally.
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 4e9922790f6e..c09fbdf924b1 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -106,7 +106,7 @@ void __init setup_smp(void)
-int start_secondary_cpu(int cpu, struct task_struct *tidle)
+static int start_secondary_cpu(int cpu, struct task_struct *tidle)
 	if (cpu_ops[cpu]->cpu_start)
 		return cpu_ops[cpu]->cpu_start(cpu, tidle);

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2020-07-30  0:25 [PATCH] RISC-V: Fix build warning for smpboot.c Atish Patra

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