...

study/kernel/process/task/current/Makefile

@@ -0,0 +1,18 @@
+ifneq ($(KERNELRELEASE),)
+
+obj-m := my_current.o
+
+else
+
+KERNELDIR ?= /lib/modules/$(shell uname -r)/build
+
+PWD := $(shell pwd)
+
+all:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+
+
+endif

study/kernel/process/task/current/my_current.c

@@ -0,0 +1,39 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+
+#ifndef THREAD_SIZE
+#define THREAD_SIZE 0x00002000
+#endif
+
+#define my_current my_get_current
+#define my_get_current   (my_current_thread_info()->task)
+
+register unsigned long my_current_stack_pointer asm("esp") __used;
+
+ static inline struct thread_info *my_current_thread_info(void)
+{
+         return (struct thread_info *)
+                 (my_current_stack_pointer & ~(THREAD_SIZE - 1));
+}
+
+static int __init lkp_init(void)
+{
+   printk("pid = %d\n",current->pid);
+   printk("name = %s\n",current->comm);
+   printk("pid = %d\n",my_current->pid);
+   printk("name = %s\n",my_current->comm);
+   return 0;
+}
+
+static void __exit lkp_cleanup(void)
+{
+   printk("<1>bye!\n");
+}
+
+module_init(lkp_init);
+module_exit(lkp_cleanup);
+MODULE_LICENSE("GPL");