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Subject[PATCH 3/3] cpumask: add show cpu map functions v2
  * Add cpu_sysdev_class functions to display the following maps
with cpulist_scnprintf().

cpu_online_map
cpu_present_map
cpu_possible_map
cpu_system_map

* Small change to include/linux/sysdev.h to allow the attribute
name and label to be different (to avoid collision with the
"attr_online" entry for bringing cpus on- and off-line.)

Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ x86/latest .../x86/linux-2.6-x86.git
+ sched-devel/latest .../mingo/linux-2.6-sched-devel.git

# x86
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@zytor.com>

Signed-off-by: Mike Travis <travis@sgi.com>
---
v2:
Removed cpus_scnprintf() and all references.
---
drivers/base/cpu.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/sysdev.h | 17 ++++++++++------
2 files changed, 61 insertions(+), 6 deletions(-)
--- linux-2.6.x86.sched.orig/drivers/base/cpu.c
+++ linux-2.6.x86.sched/drivers/base/cpu.c
@@ -103,6 +103,53 @@ static SYSDEV_ATTR(crash_notes, 0400, sh
#endif

/*
+ * Print cpu online, possible, present, and system maps
+ */
+static ssize_t print_cpus_map(char *buf, cpumask_t *map)
+{
+ int n = cpulist_scnprintf(buf, PAGE_SIZE-2, *map);
+
+ buf[n++] = '\n';
+ buf[n] = '\0';
+ return n;
+}
+
+#define print_cpus_func(type) \
+static ssize_t print_cpus_##type(struct sysdev_class *class, char *buf) \
+{ \
+ return print_cpus_map(buf, &cpu_##type##_map); \
+} \
+struct sysdev_class_attribute attr_##type##_map = \
+ _SYSDEV_CLASS_ATTR(type, 0444, print_cpus_##type, NULL)
+
+print_cpus_func(online);
+print_cpus_func(possible);
+print_cpus_func(present);
+print_cpus_func(system);
+
+struct sysdev_class_attribute *cpu_state_attr[] = {
+ &attr_online_map,
+ &attr_possible_map,
+ &attr_present_map,
+ &attr_system_map,
+};
+
+static int cpu_states_init(void)
+{
+ int i;
+ int err = 0;
+
+ for (i = 0; i < ARRAY_SIZE(cpu_state_attr); i++) {
+ int ret;
+ ret = sysdev_class_create_file(&cpu_sysdev_class,
+ cpu_state_attr[i]);
+ if (!err)
+ err = ret;
+ }
+ return err;
+}
+
+/*
* register_cpu - Setup a sysfs device for a CPU.
* @cpu - cpu->hotpluggable field set to 1 will generate a control file in
* sysfs for this CPU.
@@ -147,6 +194,9 @@ int __init cpu_dev_init(void)
int err;

err = sysdev_class_register(&cpu_sysdev_class);
+ if (!err)
+ err = cpu_states_init();
+
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
if (!err)
err = sched_create_sysfs_power_savings_entries(&cpu_sysdev_class);
--- linux-2.6.x86.sched.orig/include/linux/sysdev.h
+++ linux-2.6.x86.sched/include/linux/sysdev.h
@@ -45,12 +45,16 @@ struct sysdev_class_attribute {
ssize_t (*store)(struct sysdev_class *, const char *, size_t);
};

-#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
-struct sysdev_class_attribute attr_##_name = { \
+#define _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
+{ \
.attr = {.name = __stringify(_name), .mode = _mode }, \
.show = _show, \
.store = _store, \
-};
+}
+
+#define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store) \
+ struct sysdev_class_attribute attr_##_name = \
+ _SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)


extern int sysdev_class_register(struct sysdev_class *);
@@ -100,15 +104,16 @@ struct sysdev_attribute {
};


-#define _SYSDEV_ATTR(_name,_mode,_show,_store) \
+#define _SYSDEV_ATTR(_name, _mode, _show, _store) \
{ \
.attr = { .name = __stringify(_name), .mode = _mode }, \
.show = _show, \
.store = _store, \
}

-#define SYSDEV_ATTR(_name,_mode,_show,_store) \
-struct sysdev_attribute attr_##_name = _SYSDEV_ATTR(_name,_mode,_show,_store);
+#define SYSDEV_ATTR(_name, _mode, _show, _store) \
+ struct sysdev_attribute attr_##_name = \
+ _SYSDEV_ATTR(_name, _mode, _show, _store);

extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
--


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