[PATCH v9 13/13] ARM: consolidate pen_release instead of having per platform definitions

From: Arnd Bergmann
Date: Wed Sep 12 2012 - 10:58:51 EST

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From: Marc Zyngier <marc.zyngier@xxxxxxx>

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: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
arch/arm/include/asm/smp.h | 1 +
arch/arm/kernel/smp.c | 6 ++++++
arch/arm/mach-exynos/hotplug.c | 2 --
arch/arm/mach-exynos/platsmp.c | 7 -------
arch/arm/mach-msm/hotplug.c | 2 --
arch/arm/mach-msm/platsmp.c | 5 -----
arch/arm/mach-realview/hotplug.c | 2 --
arch/arm/mach-spear13xx/hotplug.c | 2 --
arch/arm/mach-spear13xx/platsmp.c | 5 -----
arch/arm/mach-ux500/hotplug.c | 2 --
arch/arm/mach-ux500/platsmp.c | 6 ------
arch/arm/mach-vexpress/hotplug.c | 2 --
arch/arm/plat-versatile/platsmp.c | 6 ------
13 files changed, 7 insertions(+), 41 deletions(-)

diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index 3a8cfee..2e3be16 100644
--- a/arch/arm/include/asm/smp.h
+++ b/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);

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index ac3ce02..aa4ffe6 100644
--- a/arch/arm/kernel/smp.c
+++ b/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,
diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index d0a5a70..f1461ce 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/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;
diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
index 3fad8ad..8d57e42 100644
--- a/arch/arm/mach-exynos/platsmp.c
+++ b/arch/arm/mach-exynos/platsmp.c
@@ -40,13 +40,6 @@ extern void exynos4_secondary_startup(void);
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
* or not. This is necessary for the hotplug code to work reliably.
diff --git a/arch/arm/mach-msm/hotplug.c b/arch/arm/mach-msm/hotplug.c
index d0f79e8..927a8d2 100644
--- a/arch/arm/mach-msm/hotplug.c
+++ b/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
diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c
index ba3c4b0..57af32e 100644
--- a/arch/arm/mach-msm/platsmp.c
+++ b/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);

diff --git a/arch/arm/mach-realview/hotplug.c b/arch/arm/mach-realview/hotplug.c
index 81a2a58..a5a02c2 100644
--- a/arch/arm/mach-realview/hotplug.c
+++ b/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;
diff --git a/arch/arm/mach-spear13xx/hotplug.c b/arch/arm/mach-spear13xx/hotplug.c
index 22e99b0..9b17e1e 100644
--- a/arch/arm/mach-spear13xx/hotplug.c
+++ b/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;
diff --git a/arch/arm/mach-spear13xx/platsmp.c b/arch/arm/mach-spear13xx/platsmp.c
index 806343c..2eaa3fa 100644
--- a/arch/arm/mach-spear13xx/platsmp.c
+++ b/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);
diff --git a/arch/arm/mach-ux500/hotplug.c b/arch/arm/mach-ux500/hotplug.c
index 17b9a15..4f6b2e1 100644
--- a/arch/arm/mach-ux500/hotplug.c
+++ b/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
*
diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
index b6f4e0e..d60873e 100644
--- a/arch/arm/mach-ux500/platsmp.c
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -28,12 +28,6 @@
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
* or not. This is necessary for the hotplug code to work reliably.
diff --git a/arch/arm/mach-vexpress/hotplug.c b/arch/arm/mach-vexpress/hotplug.c
index e2a960f..b36a749 100644
--- a/arch/arm/mach-vexpress/hotplug.c
+++ b/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;
diff --git a/arch/arm/plat-versatile/platsmp.c b/arch/arm/plat-versatile/platsmp.c
index 39e60ac..04ca493 100644
--- a/arch/arm/plat-versatile/platsmp.c
+++ b/arch/arm/plat-versatile/platsmp.c
@@ -20,12 +20,6 @@
#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
* or not. This is necessary for the hotplug code to work reliably.
--
1.7.10

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Next message: David Ahern: "Re: [PATCH 3/3] perf tool: give user better message if precise isnot supported"
Previous message: Arnd Bergmann: "[PATCH v9 08/13] ARM: SoC: convert shmobile SMP to SoC descriptor"
In reply to: Arnd Bergmann: "[PATCH v9 08/13] ARM: SoC: convert shmobile SMP to SoC descriptor"
Next in thread: Nicolas Pitre: "Re: [PATCH v9 13/13] ARM: consolidate pen_release instead of havingper platform definitions"
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