ARM: consolidate pen_release instead of having per platform definitions

Almost each SMP platform defines pen_release to manage booting secondary
CPUs. This of course clashes with the single zImage effort.

Add the pen_release definition to the ARM SMP code, and remove all others.
This should only be used by platforms which lack any kind of CPU power
management...
Reported-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
Acked-by: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

arch/arm/include/asm/smp.h

@@ -70,6 +70,7 @@ struct secondary_data {
 	void *stack;
 };
 extern struct secondary_data secondary_data;
+extern volatile int pen_release;
 
 extern int __cpu_disable(void);
 

arch/arm/kernel/smp.c

@@ -51,6 +51,12 @@
  */
 struct secondary_data secondary_data;
 
+/*
+ * control for which core is the next to come out of the secondary
+ * boot "holding pen"
+ */
+volatile int __cpuinitdata pen_release = -1;
+
 enum ipi_msg_type {
 	IPI_TIMER = 2,
 	IPI_RESCHEDULE,

arch/arm/mach-exynos/hotplug.c

@@ -23,8 +23,6 @@
 
 #include "common.h"
 
-extern volatile int pen_release;
-
 static inline void cpu_enter_lowpower(void)
 {
 	unsigned int v;

arch/arm/mach-exynos/platsmp.c

@@ -39,13 +39,6 @@ extern void exynos4_secondary_startup(void);
 #define CPU1_BOOT_REG		(samsung_rev() == EXYNOS4210_REV_1_1 ? \
 				S5P_INFORM5 : S5P_VA_SYSRAM)
 
-/*
- * control for which core is the next to come out of the secondary
- * boot "holding pen"
- */
-
-volatile int __cpuinitdata pen_release = -1;
-
 /*
  * Write pen_release in a way that is guaranteed to be visible to all
  * observers, irrespective of whether they're taking part in coherency

arch/arm/mach-msm/hotplug.c

@@ -15,8 +15,6 @@
 
 #include "core.h"
 
-extern volatile int pen_release;
-
 static inline void cpu_enter_lowpower(void)
 {
 	/* Just flush the cache. Changing the coherency is not yet

arch/arm/mach-msm/platsmp.c

@@ -35,11 +35,6 @@
 #define GIC_PPI_EDGE_MASK 0xFFFFD7FF
 
 extern void msm_secondary_startup(void);
-/*
- * control for which core is the next to come out of the secondary
- * boot "holding pen".
- */
-volatile int pen_release = -1;
 
 static DEFINE_SPINLOCK(boot_lock);
 

arch/arm/mach-realview/hotplug.c

@@ -16,8 +16,6 @@
 #include <asm/cp15.h>
 #include <asm/smp_plat.h>
 
-extern volatile int pen_release;
-
 static inline void cpu_enter_lowpower(void)
 {
 	unsigned int v;

arch/arm/mach-spear13xx/hotplug.c

@@ -17,8 +17,6 @@
 #include <asm/cp15.h>
 #include <asm/smp_plat.h>
 
-extern volatile int pen_release;
-
 static inline void cpu_enter_lowpower(void)
 {
 	unsigned int v;

arch/arm/mach-spear13xx/platsmp.c

@@ -21,11 +21,6 @@
 #include <mach/spear.h>
 #include <mach/generic.h>
 
-/*
- * control for which core is the next to come out of the secondary
- * boot "holding pen"
- */
-volatile int __cpuinitdata pen_release = -1;
 static DEFINE_SPINLOCK(boot_lock);
 
 static void __iomem *scu_base = IOMEM(VA_SCU_BASE);

arch/arm/mach-ux500/hotplug.c

@@ -17,8 +17,6 @@
 
 #include <mach/setup.h>
 
-extern volatile int pen_release;
-
 /*
  * platform-specific code to shutdown a CPU
  *

arch/arm/mach-ux500/platsmp.c

@@ -27,12 +27,6 @@
 /* This is called from headsmp.S to wakeup the secondary core */
 extern void u8500_secondary_startup(void);
 
-/*
- * control for which core is the next to come out of the secondary
- * boot "holding pen"
- */
-volatile int pen_release = -1;
-
 /*
  * Write pen_release in a way that is guaranteed to be visible to all
  * observers, irrespective of whether they're taking part in coherency

arch/arm/mach-vexpress/hotplug.c

@@ -16,8 +16,6 @@
 #include <asm/smp_plat.h>
 #include <asm/cp15.h>
 
-extern volatile int pen_release;
-
 static inline void cpu_enter_lowpower(void)
 {
 	unsigned int v;

arch/arm/plat-versatile/platsmp.c

@@ -19,12 +19,6 @@
 #include <asm/smp_plat.h>
 #include <asm/hardware/gic.h>
 
-/*
- * control for which core is the next to come out of the secondary
- * boot "holding pen"
- */
-volatile int __cpuinitdata pen_release = -1;
-
 /*
  * Write pen_release in a way that is guaranteed to be visible to all
  * observers, irrespective of whether they're taking part in coherency