LoongArch: Export symbol for function smp_send_reschedule()

mainline inclusion
from mainline-v6.1
commit 143d64bd
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP
CVE: NA

--------------------------------

From upstream commit 143d64bd

Function smp_send_reschedule() is standard kernel API, which is defined
in header file include/linux/smp.h. However, on LoongArch it is defined
as an inline function, this is confusing and kernel modules can not use
this function.

Now we define smp_send_reschedule() as a general function, and add a
EXPORT_SYMBOL_GPL on this function, so that kernel modules can use it.
Signed-off-by: NBibo Mao <maobibo@loongson.cn>
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>
Change-Id: Iafc643ec9282b60ad211f86d66804f30f9932304

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)
-{
-	loongson3_send_ipi_single(cpu, SMP_RESCHEDULE);
-}
-
 static inline void arch_send_call_function_single_ipi(int cpu)
 {
 	loongson3_send_ipi_single(cpu, SMP_CALL_FUNCTION);

arch/loongarch/kernel/smp.c

@@ -151,6 +151,17 @@ void loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 		ipi_write_action(cpu_logical_map(i), (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)
+{
+	loongson3_send_ipi_single(cpu, SMP_RESCHEDULE);
+}
+EXPORT_SYMBOL_GPL(smp_send_reschedule);
+
 irqreturn_t loongson3_ipi_interrupt(int irq, void *dev)
 {
 	unsigned int action;