[PATCHv2 2/2] cpu: Register a generic CPU device on architectures that currently do not
From: Ben Hutchings <hidden>
Date: 2012-01-10 03:04:40
Also in:
linux-m68k, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, m68k architecture, microblaze architecture, openrisc architecture, tensilica xtensa port (xtensa), the rest, user-mode linux (uml) · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Geert Uytterhoeven, Michal Simek, Jonas Bonn, Stefan Kristiansson, Stafford Horne, Chris Zankel, Max Filippov, Linus Torvalds, Richard Weinberger, Anton Ivanov, Johannes Berg
frv, h8300, m68k, microblaze, openrisc, score, um and xtensa currently do not register a CPU device. Add the config option GENERIC_CPU_DEVICES which causes a generic CPU device to be registered for each present CPU, and make all these architectures select it. Richard Weinberger [off-list ref] covered UML and suggested using per_cpu. Signed-off-by: Ben Hutchings <redacted> --- This is a combination of the previous version with Richard's patch for UML. I also changed the error path to use panic() so that nothing else has to check for missing CPU devices. Ben. arch/frv/Kconfig | 1 + arch/h8300/Kconfig | 1 + arch/m68k/Kconfig | 1 + arch/microblaze/Kconfig | 1 + arch/openrisc/Kconfig | 1 + arch/score/Kconfig | 1 + arch/um/Kconfig.common | 1 + arch/xtensa/Kconfig | 1 + drivers/base/Kconfig | 4 ++++ drivers/base/cpu.c | 19 +++++++++++++++++++ 10 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index bad27a6..70554ba 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig@@ -8,6 +8,7 @@ config FRV select HAVE_GENERIC_HARDIRQS select GENERIC_IRQ_SHOW select ARCH_HAVE_NMI_SAFE_CMPXCHG + select GENERIC_CPU_DEVICES config ZONE_DMA bool
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index d1f377f..56e890d 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig@@ -4,6 +4,7 @@ config H8300 select HAVE_IDE select HAVE_GENERIC_HARDIRQS select GENERIC_IRQ_SHOW + select GENERIC_CPU_DEVICES config SYMBOL_PREFIX string
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 81fdaa7..f755ecf 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig@@ -6,6 +6,7 @@ config M68K select HAVE_GENERIC_HARDIRQS select GENERIC_IRQ_SHOW select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS + select GENERIC_CPU_DEVICES config RWSEM_GENERIC_SPINLOCK bool
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index e446bab..16ca257 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig@@ -17,6 +17,7 @@ config MICROBLAZE select HAVE_GENERIC_HARDIRQS select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW + select GENERIC_CPU_DEVICES config SWAP def_bool n
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index e518a5a..978e0bd 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig@@ -15,6 +15,7 @@ config OPENRISC select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_IOMAP + select GENERIC_CPU_DEVICES config MMU def_bool y
diff --git a/arch/score/Kconfig b/arch/score/Kconfig
index 8b0c946..51cbf1e 100644
--- a/arch/score/Kconfig
+++ b/arch/score/Kconfig@@ -7,6 +7,7 @@ config SCORE select HAVE_MEMBLOCK select HAVE_MEMBLOCK_NODE_MAP select ARCH_DISCARD_MEMBLOCK + select GENERIC_CPU_DEVICES choice prompt "System type"
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index a923483..b37ae70 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common@@ -8,6 +8,7 @@ config UML default y select HAVE_GENERIC_HARDIRQS select GENERIC_IRQ_SHOW + select GENERIC_CPU_DEVICES config MMU bool
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index c346ccd..8a3f835 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig@@ -9,6 +9,7 @@ config XTENSA select HAVE_IDE select HAVE_GENERIC_HARDIRQS select GENERIC_IRQ_SHOW + select GENERIC_CPU_DEVICES help Xtensa processors are 32-bit RISC machines designed by Tensilica primarily for embedded systems. These processors are both
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 21cf46f..4ebc5d3 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig@@ -172,6 +172,10 @@ config SYS_HYPERVISOR bool default n +config GENERIC_CPU_DEVICES + bool + default n + source "drivers/base/regmap/Kconfig" endmenu
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index bba70d0..db87e78 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c@@ -11,6 +11,7 @@ #include <linux/device.h> #include <linux/node.h> #include <linux/gfp.h> +#include <linux/percpu.h> #include "base.h"
@@ -275,11 +276,29 @@ bool cpu_is_hotpluggable(unsigned cpu) } EXPORT_SYMBOL_GPL(cpu_is_hotpluggable); +#ifdef CONFIG_GENERIC_CPU_DEVICES +static DEFINE_PER_CPU(struct cpu, cpu_devices); +#endif + +static void __init cpu_dev_register_generic(void) +{ +#ifdef CONFIG_GENERIC_CPU_DEVICES + int i; + + for_each_possible_cpu(i) { + if (register_cpu(&per_cpu(cpu_devices, i), i)) + panic("Failed to register CPU device"); + } +#endif +} + void __init cpu_dev_init(void) { if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups)) panic("Failed to register CPU subsystem"); + cpu_dev_register_generic(); + #if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT) sched_create_sysfs_power_savings_entries(cpu_subsys.dev_root); #endif
--
1.7.8.2