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authorAshok Raj <ashok.raj@intel.com>2005-10-30 17:59:49 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 20:37:14 -0500
commitad74557a49d1dea428fb0ad60e75a5aa37610e1d (patch)
tree4240115b224d3b3a323da8aa9325fc3bf4b73b50 /drivers/base/cpu.c
parent5d35704028d09a183448daceab5dcb94f21a3645 (diff)
[PATCH] introduce get_cpu_sysdev() to retrieve a sysfs entry for a cpu.
Some modules creating sysfs entries under /sys/devices/system/cpu/cpuX/ need to know the parent sysfs entry to make devices under them. This will just return the sysfs entry for a given cpu. sysfs entries showing under each cpu sysfs can be easily created if such entries can be created by registering a sysfs driver for cpuclass. The issue is when the entry is created the CPU may not be online, hence we would need to defer the creation until the online notification comes. Current users: cache entries for Intel CPU's and cpufreq subsystem. Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Zwane Mwaikambo <zwane@holomorphy.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/base/cpu.c')
-rw-r--r--drivers/base/cpu.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 081c927b1ed8..a95844790f7b 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -16,6 +16,8 @@ struct sysdev_class cpu_sysdev_class = {
16}; 16};
17EXPORT_SYMBOL(cpu_sysdev_class); 17EXPORT_SYMBOL(cpu_sysdev_class);
18 18
19static struct sys_device *cpu_sys_devices[NR_CPUS];
20
19#ifdef CONFIG_HOTPLUG_CPU 21#ifdef CONFIG_HOTPLUG_CPU
20int __attribute__((weak)) smp_prepare_cpu (int cpu) 22int __attribute__((weak)) smp_prepare_cpu (int cpu)
21{ 23{
@@ -64,6 +66,7 @@ static void __devinit register_cpu_control(struct cpu *cpu)
64} 66}
65void unregister_cpu(struct cpu *cpu, struct node *root) 67void unregister_cpu(struct cpu *cpu, struct node *root)
66{ 68{
69 int logical_cpu = cpu->sysdev.id;
67 70
68 if (root) 71 if (root)
69 sysfs_remove_link(&root->sysdev.kobj, 72 sysfs_remove_link(&root->sysdev.kobj,
@@ -71,7 +74,7 @@ void unregister_cpu(struct cpu *cpu, struct node *root)
71 sysdev_remove_file(&cpu->sysdev, &attr_online); 74 sysdev_remove_file(&cpu->sysdev, &attr_online);
72 75
73 sysdev_unregister(&cpu->sysdev); 76 sysdev_unregister(&cpu->sysdev);
74 77 cpu_sys_devices[logical_cpu] = NULL;
75 return; 78 return;
76} 79}
77#else /* ... !CONFIG_HOTPLUG_CPU */ 80#else /* ... !CONFIG_HOTPLUG_CPU */
@@ -103,10 +106,19 @@ int __devinit register_cpu(struct cpu *cpu, int num, struct node *root)
103 kobject_name(&cpu->sysdev.kobj)); 106 kobject_name(&cpu->sysdev.kobj));
104 if (!error && !cpu->no_control) 107 if (!error && !cpu->no_control)
105 register_cpu_control(cpu); 108 register_cpu_control(cpu);
109 if (!error)
110 cpu_sys_devices[num] = &cpu->sysdev;
106 return error; 111 return error;
107} 112}
108 113
109 114struct sys_device *get_cpu_sysdev(int cpu)
115{
116 if (cpu < NR_CPUS)
117 return cpu_sys_devices[cpu];
118 else
119 return NULL;
120}
121EXPORT_SYMBOL_GPL(get_cpu_sysdev);
110 122
111int __init cpu_dev_init(void) 123int __init cpu_dev_init(void)
112{ 124{