[PATCH v6 14/15] ARM: hotplug: Introduce dummy_cpu_disable

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Most platforms don't implement their cpu_disable method.
Some because they simply don't offer the capability, some other
because nobody cared enough to implement the necessary code.

Either way, this code is duplicated all over the place. Implement
a global dummy_cpu_disable method and convert all SMP (but shmobile)
to use it. Hopefully the "dummy" prefix will be an incentive
for people to do the right thing.

Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Colin Cross <ccross@xxxxxxxxxxx>
Cc: David Brown <davidb@xxxxxxxxxxxxxx>
Cc: Kukjin Kim <kgene.kim@xxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
Cc: Nicolas Pitre <nico@xxxxxxxxxxx>
Cc: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Cc: Stephen Warren <swarren@xxxxxxxxxx>
Cc: Shawn Guo <shawn.guo@xxxxxxxxxx>
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
 arch/arm/include/asm/smp_plat.h          |    1 +
 arch/arm/kernel/smp.c                    |    9 +++++++++
 arch/arm/mach-exynos/common.h            |    1 -
 arch/arm/mach-exynos/hotplug.c           |    9 ---------
 arch/arm/mach-exynos/platsmp.c           |    2 +-
 arch/arm/mach-highbank/core.h            |    1 -
 arch/arm/mach-highbank/hotplug.c         |    9 ---------
 arch/arm/mach-highbank/platsmp.c         |    2 +-
 arch/arm/mach-imx/hotplug.c              |    9 ---------
 arch/arm/mach-imx/platsmp.c              |    2 +-
 arch/arm/mach-msm/core.h                 |    1 -
 arch/arm/mach-msm/hotplug.c              |    9 ---------
 arch/arm/mach-msm/platsmp.c              |    2 +-
 arch/arm/mach-omap2/common.h             |    1 -
 arch/arm/mach-omap2/omap-hotplug.c       |    9 ---------
 arch/arm/mach-omap2/omap-smp.c           |    2 +-
 arch/arm/mach-realview/core.h            |    1 -
 arch/arm/mach-realview/hotplug.c         |    9 ---------
 arch/arm/mach-realview/platsmp.c         |    2 +-
 arch/arm/mach-tegra/common.h             |    1 -
 arch/arm/mach-tegra/hotplug.c            |    9 ---------
 arch/arm/mach-tegra/platsmp.c            |    2 +-
 arch/arm/mach-ux500/hotplug.c            |    9 ---------
 arch/arm/mach-ux500/include/mach/setup.h |    1 -
 arch/arm/mach-ux500/platsmp.c            |    2 +-
 arch/arm/mach-vexpress/core.h            |    1 -
 arch/arm/mach-vexpress/hotplug.c         |    9 ---------
 arch/arm/mach-vexpress/platsmp.c         |    2 +-
 arch/arm/plat-mxc/include/mach/common.h  |    1 -
 29 files changed, 19 insertions(+), 99 deletions(-)

diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h
index 8b2ffe2..f43d039 100644
--- a/arch/arm/include/asm/smp_plat.h
+++ b/arch/arm/include/asm/smp_plat.h
@@ -51,5 +51,6 @@ extern int __cpu_logical_map[];
 
 /* Only use this if your platform doesn't have any CPU PM */
 extern int dummy_cpu_kill(unsigned int cpu);
+extern int dummy_cpu_disable(unsigned int cpu);
 
 #endif
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index eabd6b8..e0d1622 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -184,6 +184,15 @@ int dummy_cpu_kill(unsigned int cpu)
 	return 1;
 }
 
+int dummy_cpu_disable(unsigned int cpu)
+{
+	/*
+	 * we don't allow CPU 0 to be shutdown (it is still too special
+	 * e.g. clock tick interrupts)
+	 */
+	return cpu == 0 ? -EPERM : 0;
+}
+
 static int __cpuinit platform_cpu_kill(unsigned int cpu)
 {
 	if (soc_smp_ops && soc_smp_ops->cpu_kill)
diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 9046df8..f13631a 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -32,7 +32,6 @@ extern struct arm_soc_smp_ops		exynos4_soc_smp_ops;
 extern struct arm_soc_desc		exynos4_soc_desc;
 
 extern void exynos4_cpu_die(unsigned int cpu);
-extern int  exynos4_cpu_disable(unsigned int cpu);
 
 #ifdef CONFIG_ARCH_EXYNOS
 extern  int exynos_init(void);
diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 1235df1..be7a96b 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -120,12 +120,3 @@ void exynos4_cpu_die(unsigned int cpu)
 	if (spurious)
 		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
 }
-
-int exynos4_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
index b263e63..4d22c2a 100644
--- a/arch/arm/mach-exynos/platsmp.c
+++ b/arch/arm/mach-exynos/platsmp.c
@@ -209,6 +209,6 @@ struct arm_soc_smp_ops exynos4_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= exynos4_cpu_die,
-	.cpu_disable		= exynos4_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-highbank/core.h b/arch/arm/mach-highbank/core.h
index 115793e..7f4aaca 100644
--- a/arch/arm/mach-highbank/core.h
+++ b/arch/arm/mach-highbank/core.h
@@ -11,7 +11,6 @@ static inline void highbank_lluart_map_io(void) {}
 #endif
 
 extern void highbank_cpu_die(unsigned int cpu);
-extern int highbank_cpu_disable(unsigned int cpu);
 
 extern struct arm_soc_smp_init_ops	highbank_soc_smp_init_ops;
 extern struct arm_soc_smp_ops		highbank_soc_smp_ops;
diff --git a/arch/arm/mach-highbank/hotplug.c b/arch/arm/mach-highbank/hotplug.c
index 6fda597..1277da3 100644
--- a/arch/arm/mach-highbank/hotplug.c
+++ b/arch/arm/mach-highbank/hotplug.c
@@ -40,12 +40,3 @@ void highbank_cpu_die(unsigned int cpu)
 	/* We should never return from idle */
 	panic("highbank: cpu %d unexpectedly exit from shutdown\n", cpu);
 }
-
-int highbank_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * CPU0 should not be shut down via hotplug.  cpu_idle can WFI
-	 * or a proper shutdown or hibernate should be used.
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-highbank/platsmp.c b/arch/arm/mach-highbank/platsmp.c
index b90ad83..789147d 100644
--- a/arch/arm/mach-highbank/platsmp.c
+++ b/arch/arm/mach-highbank/platsmp.c
@@ -89,6 +89,6 @@ struct arm_soc_smp_ops highbank_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= highbank_cpu_die,
-	.cpu_disable		= highbank_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-imx/hotplug.c b/arch/arm/mach-imx/hotplug.c
index 7e75f8e..63d5144 100644
--- a/arch/arm/mach-imx/hotplug.c
+++ b/arch/arm/mach-imx/hotplug.c
@@ -28,12 +28,3 @@ void imx_cpu_die(unsigned int cpu)
 	/* We should never return from idle */
 	panic("cpu %d unexpectedly exit from shutdown\n", cpu);
 }
-
-int imx_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-imx/platsmp.c b/arch/arm/mach-imx/platsmp.c
index 64d9c9e..2fea1e3 100644
--- a/arch/arm/mach-imx/platsmp.c
+++ b/arch/arm/mach-imx/platsmp.c
@@ -97,6 +97,6 @@ struct arm_soc_smp_ops imx_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= imx_cpu_die,
-	.cpu_disable		= imx_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-msm/core.h b/arch/arm/mach-msm/core.h
index 533130d..623474a 100644
--- a/arch/arm/mach-msm/core.h
+++ b/arch/arm/mach-msm/core.h
@@ -5,4 +5,3 @@ extern struct arm_soc_smp_ops		msm_soc_smp_ops;
 extern struct arm_soc_desc		msm_soc_desc;
 
 extern void msm_cpu_die(unsigned int cpu);
-extern int  msm_cpu_disable(unsigned int cpu);
diff --git a/arch/arm/mach-msm/hotplug.c b/arch/arm/mach-msm/hotplug.c
index 5f09e5a1..d0f79e8 100644
--- a/arch/arm/mach-msm/hotplug.c
+++ b/arch/arm/mach-msm/hotplug.c
@@ -78,12 +78,3 @@ void msm_cpu_die(unsigned int cpu)
 	 */
 	cpu_leave_lowpower();
 }
-
-int msm_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-msm/platsmp.c b/arch/arm/mach-msm/platsmp.c
index 0664a91..f7e27d9 100644
--- a/arch/arm/mach-msm/platsmp.c
+++ b/arch/arm/mach-msm/platsmp.c
@@ -185,6 +185,6 @@ struct arm_soc_smp_ops msm_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= msm_cpu_die,
-	.cpu_disable		= msm_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index e0ae233..c8e3c3e 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -196,7 +196,6 @@ extern void omap_auxcoreboot_addr(u32 cpu_addr);
 extern u32 omap_read_auxcoreboot0(void);
 
 extern void omap4_cpu_die(unsigned int cpu);
-extern int  omap4_cpu_disable(unsigned int cpu);
 
 struct arm_soc_smp_init_ops;
 struct arm_soc_smp_ops;
diff --git a/arch/arm/mach-omap2/omap-hotplug.c b/arch/arm/mach-omap2/omap-hotplug.c
index d3d01fe..1d95520 100644
--- a/arch/arm/mach-omap2/omap-hotplug.c
+++ b/arch/arm/mach-omap2/omap-hotplug.c
@@ -56,12 +56,3 @@ void omap4_cpu_die(unsigned int cpu)
 		pr_debug("CPU%u: spurious wakeup call\n", cpu);
 	}
 }
-
-int omap4_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index 2c97b14..6b1d652 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -194,6 +194,6 @@ struct arm_soc_smp_ops omap4_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= omap4_cpu_die,
-	.cpu_disable		= omap4_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-realview/core.h b/arch/arm/mach-realview/core.h
index 6cdfdf9..dd4bcdb 100644
--- a/arch/arm/mach-realview/core.h
+++ b/arch/arm/mach-realview/core.h
@@ -72,6 +72,5 @@ extern struct arm_soc_smp_init_ops	realview_soc_smp_init_ops;
 extern struct arm_soc_smp_ops		realview_soc_smp_ops;
 
 extern void realview_cpu_die(unsigned int cpu);
-extern int  realview_cpu_disable(unsigned int cpu);
 
 #endif
diff --git a/arch/arm/mach-realview/hotplug.c b/arch/arm/mach-realview/hotplug.c
index 7f28a56..12af634 100644
--- a/arch/arm/mach-realview/hotplug.c
+++ b/arch/arm/mach-realview/hotplug.c
@@ -112,12 +112,3 @@ void realview_cpu_die(unsigned int cpu)
 	if (spurious)
 		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
 }
-
-int realview_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index ebe975e..5b7535d 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -91,6 +91,6 @@ struct arm_soc_smp_ops realview_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= realview_cpu_die,
-	.cpu_disable		= realview_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-tegra/common.h b/arch/arm/mach-tegra/common.h
index c135700..b02cc87 100644
--- a/arch/arm/mach-tegra/common.h
+++ b/arch/arm/mach-tegra/common.h
@@ -7,4 +7,3 @@ extern struct arm_soc_smp_init_ops	tegra_soc_smp_init_ops;
 extern struct arm_soc_smp_ops		tegra_soc_smp_ops;
 
 extern void tegra_cpu_die(unsigned int cpu);
-extern int  tegra_cpu_disable(unsigned int cpu);
diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c
index 51e8690..15433b2 100644
--- a/arch/arm/mach-tegra/hotplug.c
+++ b/arch/arm/mach-tegra/hotplug.c
@@ -110,12 +110,3 @@ void tegra_cpu_die(unsigned int cpu)
 	if (spurious)
 		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
 }
-
-int tegra_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c
index c31018e..4edc8ab 100644
--- a/arch/arm/mach-tegra/platsmp.c
+++ b/arch/arm/mach-tegra/platsmp.c
@@ -147,6 +147,6 @@ struct arm_soc_smp_ops tegra_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= tegra_cpu_die,
-	.cpu_disable		= tegra_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-ux500/hotplug.c b/arch/arm/mach-ux500/hotplug.c
index 1e86d5a..ec1c77f 100644
--- a/arch/arm/mach-ux500/hotplug.c
+++ b/arch/arm/mach-ux500/hotplug.c
@@ -46,12 +46,3 @@ void ux500_cpu_die(unsigned int cpu)
 	/* directly enter low power state, skipping secure registers */
 	platform_do_lowpower(cpu);
 }
-
-int ux500_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-ux500/include/mach/setup.h b/arch/arm/mach-ux500/include/mach/setup.h
index 72ba37d..2935f85 100644
--- a/arch/arm/mach-ux500/include/mach/setup.h
+++ b/arch/arm/mach-ux500/include/mach/setup.h
@@ -56,6 +56,5 @@ extern struct arm_soc_smp_ops ux500_soc_smp_ops;
 extern struct arm_soc_desc ux500_soc_desc;
 
 extern void ux500_cpu_die(unsigned int cpu);
-extern int  ux500_cpu_disable(unsigned int cpu);
 
 #endif /*  __ASM_ARCH_SETUP_H */
diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
index f105192..bbd6480 100644
--- a/arch/arm/mach-ux500/platsmp.c
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -187,6 +187,6 @@ struct arm_soc_smp_ops ux500_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= ux500_cpu_die,
-	.cpu_disable		= ux500_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/mach-vexpress/core.h b/arch/arm/mach-vexpress/core.h
index f072682..d9b1ec0 100644
--- a/arch/arm/mach-vexpress/core.h
+++ b/arch/arm/mach-vexpress/core.h
@@ -25,4 +25,3 @@ extern struct arm_soc_smp_init_ops	vexpress_soc_smp_init_ops;
 extern struct arm_soc_smp_ops		vexpress_soc_smp_ops;
 
 extern void vexpress_cpu_die(unsigned int cpu);
-extern int  vexpress_cpu_disable(unsigned int cpu);
diff --git a/arch/arm/mach-vexpress/hotplug.c b/arch/arm/mach-vexpress/hotplug.c
index 11d2c77..e1a7fef 100644
--- a/arch/arm/mach-vexpress/hotplug.c
+++ b/arch/arm/mach-vexpress/hotplug.c
@@ -108,12 +108,3 @@ void vexpress_cpu_die(unsigned int cpu)
 	if (spurious)
 		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
 }
-
-int vexpress_cpu_disable(unsigned int cpu)
-{
-	/*
-	 * we don't allow CPU 0 to be shutdown (it is still too special
-	 * e.g. clock tick interrupts)
-	 */
-	return cpu == 0 ? -EPERM : 0;
-}
diff --git a/arch/arm/mach-vexpress/platsmp.c b/arch/arm/mach-vexpress/platsmp.c
index 80ab030..a5196f87 100644
--- a/arch/arm/mach-vexpress/platsmp.c
+++ b/arch/arm/mach-vexpress/platsmp.c
@@ -62,6 +62,6 @@ struct arm_soc_smp_ops vexpress_soc_smp_ops __initdata = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_kill		= dummy_cpu_kill,
 	.cpu_die		= vexpress_cpu_die,
-	.cpu_disable		= vexpress_cpu_disable,
+	.cpu_disable		= dummy_cpu_disable,
 #endif
 };
diff --git a/arch/arm/plat-mxc/include/mach/common.h b/arch/arm/plat-mxc/include/mach/common.h
index 08b241c..c0d0a21 100644
--- a/arch/arm/plat-mxc/include/mach/common.h
+++ b/arch/arm/plat-mxc/include/mach/common.h
@@ -134,7 +134,6 @@ extern int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode);
 extern void imx6q_clock_map_io(void);
 
 extern void imx_cpu_die(unsigned int cpu);
-extern int imx_cpu_disable(unsigned int cpu);
 
 #ifdef CONFIG_PM
 extern void imx6q_pm_init(void);
-- 
1.7.3.4


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