linux-kernel - [PATCH] smp: kernel/panic.c

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Date:   Tue, 16 Mar 2021 00:08:19 -0400
From:   He Ying <heying24@...wei.com>
To:     <peterz@...radead.org>, <mingo@...nel.org>, <frederic@...nel.org>,
        <paulmck@...nel.org>, <christophe.leroy@...roup.eu>,
        <clg@...d.org>, <qais.yousef@....com>
CC:     <johnny.chenyi@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] smp: kernel/panic.c - silence warnings

We found these warnings in kernel/panic.c by using sparse tool:
warning: symbol 'panic_smp_self_stop' was not declared.
warning: symbol 'nmi_panic_self_stop' was not declared.
warning: symbol 'crash_smp_send_stop' was not declared.

To avoid them, add declarations for these three functions in
include/linux/smp.h.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: He Ying <heying24@...wei.com>
---
 include/linux/smp.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/smp.h b/include/linux/smp.h
index 70c6f6284dcf..861a253cc179 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -50,6 +50,14 @@ extern unsigned int total_cpus;
 int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
 			     int wait);
 
+/*
+ * Cpus stopping functions in panic. All have default weak definations.
+ * Architecure dependent code may override them.
+ */
+void panic_smp_self_stop(void);
+void nmi_panic_self_stop(struct pt_regs *regs);
+void crash_smp_send_stop(void);
+
 /*
  * Call a function on all processors
  */
-- 
2.17.1