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

From: Andrey Ryabinin
Date: Mon Jul 14 2014 - 12:58:07 EST

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]

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>
#include <linux/mtd/physmap.h>

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/