Advanced users • Re: "Realtime" GPIO with bcm2835 (AirSpayce)library, how to turn scheduling back on

Code:

#include <linux/kernel.h>#include <linux/kobject.h>#include <linux/module.h>static struct kobject *the_kobj;static ssize_t sysfs_read(struct kobject *kobj, struct kobj_attribute *attr, char *buf){    const char* message = "just a useless test of the read function";    return sprintf(buf, "%s\n", message);}static ssize_t sysfs_write(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count){    printk(KERN_INFO "my_critical_proc: runing the critical procedure\n");    local_irq_disable();    // do your stuff    local_irq_enable();    return count;}static struct kobj_attribute sysfs_attribute = __ATTR( initiate, 0660, sysfs_read, sysfs_write);static int my_critical_proc_init(void){    printk(KERN_INFO "my_critical_proc: init\n");    the_kobj = kobject_create_and_add("my_critical_proc", kernel_kobj);    if(!the_kobj)    {        printk(KERN_ALERT "my_critical_proc: kobject_create_and_add failed\n");        return -ENOMEM;    }    if(sysfs_create_file(the_kobj, &sysfs_attribute.attr))    {        printk(KERN_ALERT "my_critical_proc: failed to create the sys file\n");        return -EFAULT;    }    return 0;}static void my_critical_proc_exit(void){    kobject_put(the_kobj);   printk(KERN_INFO "my_critical_proc: exit\n");}module_init(my_critical_proc_init);module_exit(my_critical_proc_exit);MODULE_DESCRIPTION("Description");MODULE_AUTHOR("Copyright");MODULE_LICENSE("GPL v2");

Code:

obj-m += my_critical_proc.oall:make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modulesclean:make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean