x86/apic: Split out restore_boot_irq_mode() from disable_IO_APIC()

This is a preparation patch. Split out the code which restores boot
irq mode from disable_IO_APIC() into the new restore_boot_irq_mode()
function.

No functional changes.

Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: douly.fnst@cn.fujitsu.com
Cc: joro@8bytes.org
Cc: prarit@redhat.com
Cc: uobergfe@redhat.com
Link: http://lkml.kernel.org/r/20180214054656.3780-2-bhe@redhat.com
[ Build fix for !CONFIG_IO_APIC and rewrote the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/io_apic.h

@@ -193,6 +193,7 @@ static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 extern void setup_IO_APIC(void);
 extern void enable_IO_APIC(void);
 extern void disable_IO_APIC(void);
+extern void restore_boot_irq_mode(void);
 extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
 extern void print_IO_APICs(void);
 #else  /* !CONFIG_X86_IO_APIC */
@@ -232,6 +233,7 @@ static inline void io_apic_init_mappings(void) { }
 
 static inline void setup_IO_APIC(void) { }
 static inline void enable_IO_APIC(void) { }
+static inline void restore_boot_irq_mode(void) { }
 
 #endif
 

arch/x86/kernel/apic/io_apic.c

@@ -1448,6 +1448,11 @@ void disable_IO_APIC(void)
 	 */
 	clear_IO_APIC();
 
+	restore_boot_irq_mode();
+}
+
+void restore_boot_irq_mode(void)
+{
 	if (!nr_legacy_irqs())
 		return;