linux-kernel - [PATCH] LoongArch: export symbol with function smp_send

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Message-Id: <20221202075854.2253116-1-maobibo@loongson.cn>
Date:   Fri,  2 Dec 2022 15:58:54 +0800
From:   Bibo Mao <maobibo@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     WANG Xuerui <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH] LoongArch: export symbol with function smp_send_reschedule

Function smp_send_reschedule is standard kernel ABI, which is
defined header file include/linux/smp.h, however on LoongArch
it is defined as inline function, so that kernel module can
not use this function.

Now define smp_send_reschedule as general function, and add
EXPORT_SYMBOL_GPL on this function, so that kernel modules can
use it.

Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
---
 arch/loongarch/include/asm/smp.h | 10 ----------
 arch/loongarch/kernel/smp.c      | 11 +++++++++++
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
index 3dd172d9ffea..d82687390b4a 100644
--- a/arch/loongarch/include/asm/smp.h
+++ b/arch/loongarch/include/asm/smp.h
@@ -78,16 +78,6 @@ extern void calculate_cpu_foreign_map(void);
  */
 extern void show_ipi_list(struct seq_file *p, int prec);
 
-/*
- * This function sends a 'reschedule' IPI to another CPU.
- * it goes straight through and wastes no time serializing
- * anything. Worst case is that we lose a reschedule ...
- */
-static inline void smp_send_reschedule(int cpu)
-{
-	loongson_send_ipi_single(cpu, SMP_RESCHEDULE);
-}
-
 static inline void arch_send_call_function_single_ipi(int cpu)
 {
 	loongson_send_ipi_single(cpu, SMP_CALL_FUNCTION);
diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
index 6ed72f7ff278..51dd3c3f06cb 100644
--- a/arch/loongarch/kernel/smp.c
+++ b/arch/loongarch/kernel/smp.c
@@ -141,6 +141,17 @@ void loongson_send_ipi_single(int cpu, unsigned int action)
 	ipi_write_action(cpu_logical_map(cpu), (u32)action);
 }
 
+/*
+ * This function sends a 'reschedule' IPI to another CPU.
+ * it goes straight through and wastes no time serializing
+ * anything. Worst case is that we lose a reschedule ...
+ */
+void smp_send_reschedule(int cpu)
+{
+	loongson_send_ipi_single(cpu, SMP_RESCHEDULE);
+}
+EXPORT_SYMBOL_GPL(smp_send_reschedule);
+
 void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 {
 	unsigned int i;
-- 
2.27.0