[PATCH] arm: mach-iop13xx: fix possible build failure

[Andrey Ryabinin]

From: Arnd Bergmann <arnd@xxxxxxxx>

After applying patch:
	"ARM: 8078/1: get rid of hardcoded assumptions about kernel stack size"

following build failure happens on iop13xx platform:

   In file included from include/linux/srcu.h:33:0,
                    from include/linux/notifier.h:15,
                    from include/linux/reboot.h:5,
                    from arch/arm/mach-iop13xx/include/mach/iop13xx.h:6,
                    from arch/arm/mach-iop13xx/include/mach/hardware.h:14,
                    from arch/arm/mach-iop13xx/include/mach/memory.h:4,
                    from arch/arm/include/asm/memory.h:24,
                    from arch/arm/include/asm/page.h:163,
                    from arch/arm/include/asm/thread_info.h:17,
                    from include/linux/thread_info.h:54,
                    from include/asm-generic/preempt.h:4,
                    from arch/arm/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:18,
                    from include/linux/spinlock.h:50,
                    from include/linux/seqlock.h:35,
                    from include/linux/time.h:5,
                    from include/uapi/linux/timex.h:56,
                    from include/linux/timex.h:56,
                    from include/linux/sched.h:19,
                    from arch/arm/kernel/asm-offsets.c:13:
   include/linux/rcupdate.h: In function '__rcu_read_lock':
>> include/linux/rcupdate.h:220:2: error: implicit declaration of function 'preempt_disable' [-Werror=implicit-function-declaration]
     preempt_disable();

The problem here is recursive header inclusion which could be avoided by
removing linux/reboot.h from mach/iop13xxx.h.
linux/reboot.h in include/mach/iop13xx.h is needed only for enum reboot_mode,
so header it could be replaced with a enum declaration.

Whatever patch "ARM: 8078/1: get rid of hardcoded assumptions about kernel stack size"
does, I think it's good to avoid unnecessary header inclusion here in any case.

Reported-by: kbuild test robot <fengguang.wu@xxxxxxxxx>
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrey Ryabinin <a.ryabinin@xxxxxxxxxxx>
---
 arch/arm/mach-iop13xx/include/mach/iop13xx.h | 2 +-
 arch/arm/mach-iop13xx/setup.c                | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-iop13xx/include/mach/iop13xx.h b/arch/arm/mach-iop13xx/include/mach/iop13xx.h
index 17b4027..9311ee2 100644
--- a/arch/arm/mach-iop13xx/include/mach/iop13xx.h
+++ b/arch/arm/mach-iop13xx/include/mach/iop13xx.h
@@ -3,7 +3,7 @@
 
 #ifndef __ASSEMBLY__
 
-#include <linux/reboot.h>
+enum reboot_mode;
 
 /* The ATU offsets can change based on the strapping */
 extern u32 iop13xx_atux_pmmr_offset;
diff --git a/arch/arm/mach-iop13xx/setup.c b/arch/arm/mach-iop13xx/setup.c
index bca96f4..53c316f 100644
--- a/arch/arm/mach-iop13xx/setup.c
+++ b/arch/arm/mach-iop13xx/setup.c
@@ -20,6 +20,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/serial_8250.h>
 #include <linux/io.h>
+#include <linux/reboot.h>
 #ifdef CONFIG_MTD_PHYSMAP
 #include <linux/mtd/physmap.h>
 #endif
-- 
1.8.5.5

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