[PATCH] x86: i8259: Add missing include file

[Guenter Roeck <linux@roeck-us.net>]

i8259.h uses inb/outb and thus needs to include asm/io.h to avoid the
following build error, as seen with x86_64:defconfig and CONFIG_SMP=n.

In file included from drivers/rtc/rtc-cmos.c:45:0:
arch/x86/include/asm/i8259.h: In function 'inb_pic':
arch/x86/include/asm/i8259.h:32:24: error:
	implicit declaration of function 'inb'

arch/x86/include/asm/i8259.h: In function 'outb_pic':
arch/x86/include/asm/i8259.h:45:2: error:
	implicit declaration of function 'outb'

Reported-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Suggested-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Fixes: 447ae3166702 ("x86: Don't include linux/irq.h from asm/hardirq.h")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
I have not seen a patch fly by, so here it is.

 arch/x86/include/asm/i8259.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h
index 5cdcdbd4d892..89789e8c80f6 100644
--- a/arch/x86/include/asm/i8259.h
+++ b/arch/x86/include/asm/i8259.h
@@ -3,6 +3,7 @@
 #define _ASM_X86_I8259_H
 
 #include <linux/delay.h>
+#include <asm/io.h>
 
 extern unsigned int cached_irq_mask;
 
-- 
2.7.4