sw64: split out the idle loop in idle.c

Sunway inclusion
category: performance
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XTK7

--------------------------------
Signed-off-by: NDai Xin <daixin@wxiat.com>
Reviewed-by: NHe Sheng <hesheng@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>

arch/sw_64/include/asm/idle.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_SW64_IDLE_H
+#define _ASM_SW64_IDLE_H
+
+extern void arch_cpu_idle(void);
+
+#endif /* _ASM_SW64_IDLE_H  */

arch/sw_64/kernel/Makefile

@@ -17,7 +17,7 @@ obj-y    := entry.o fpu.o traps.o process.o sys_sw64.o irq.o \
 	    irq_sw64.o signal.o setup.o ptrace.o time.o \
 	    systbls.o dup_print.o tc.o timer.o \
 	    insn.o early_init.o topology.o cacheinfo.o \
-	    vdso.o vdso/ hmcall.o stacktrace.o
+	    vdso.o vdso/ hmcall.o stacktrace.o idle.o
 
 obj-$(CONFIG_ACPI) += acpi.o
 obj-$(CONFIG_SMP)	+= smp.o

arch/sw_64/kernel/idle.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sw64 idle loop support.
+ *
+ */
+#include <linux/cpu.h>
+#include <linux/irqflags.h>
+#include <asm/cpu.h>
+#include <asm/idle.h>
+
+#ifdef CONFIG_HOTPLUG_CPU
+void arch_cpu_idle_dead(void)
+{
+	play_dead();
+}
+#endif
+
+void cpu_idle(void)
+{
+	int i;
+
+	local_irq_enable();
+	cpu_relax();
+
+	if (is_in_guest())
+		hcall(HCALL_HALT, 0, 0, 0);
+	else {
+		for (i = 0; i < 16; i++)
+			asm("nop");
+		asm("halt");
+	}
+}
+
+void arch_cpu_idle(void)
+{
+	cpu_idle();
+}

arch/sw_64/kernel/process.c

@@ -26,29 +26,6 @@ struct halt_info {
 	char *restart_cmd;
 };
 
-#ifdef CONFIG_HOTPLUG_CPU
-void arch_cpu_idle_dead(void)
-{
-	play_dead();
-}
-#endif
-
-void arch_cpu_idle(void)
-{
-	int i;
-
-	local_irq_enable();
-	cpu_relax();
-
-	if (is_in_guest())
-		hcall(HCALL_HALT, 0, 0, 0);
-	else {
-		for (i = 0; i < 16; i++)
-			asm("nop");
-		asm("halt");
-	}
-}
-
 static void common_shutdown_1(void *generic_ptr)
 {
 	struct halt_info *how = (struct halt_info *)generic_ptr;