seq_file_exam and oops...

study/debug/filesystem/procfs/00-code/seq_file_exam/Makefile

@@ -1,18 +1,81 @@
+# ------------------------------------------------------------------------------
+#
+# Makefile for the LDD-LinuxDeviceDrivers.
+#
+# Author: gatieme
+# Create: 2016-07-29 15:50:46
+# Last modified: 2016-07-29 16:10:29
+# Description:
+# 	This program is loaded as a kernel(v2.6.18 or later) module.
+# 	Use "make install" to load it into kernel.
+# 	Use "make remove" to remove the module out of kernel.
+#
+# ------------------------------------------------------------------------------
+
+
+ROOT=..
+#PLATFORM=$(shell $(ROOT)/systype.sh)
+#include $(ROOT)/Make.defines.$(PLATFORM)
+
+#	my driver description
+DRIVER_VERSION := "1.0.0"
+DRIVER_AUTHOR  := "Gatieme @ AderStep Inc..."
+DRIVER_DESC    := "Linux input module for Elo MultiTouch(MT) devices"
+DRIVER_LICENSE := "Dual BSD/GPL"
+
+
+MODULE_NAME := seq_file_exam
+EXTRA_CFLAGS  += -g
+
+
+
 ifneq ($(KERNELRELEASE),)
 
-obj-m := seq_file_exam.o
+
+
+
+obj-m := $(MODULE_NAME).o
 
 else
 
 KERNELDIR ?= /lib/modules/$(shell uname -r)/build
-#KERNELDIR ?= /home/gatieme/Work/Kernel/linux-headers-3.14-desktop/
+
 PWD := $(shell pwd)
 
-all:
+modules:
 	make -C $(KERNELDIR) M=$(PWD) modules
-	gcc test.c -o test
+
+modules_install:
+	make -C $(KERNELDIR) M=$(PWD) modules_install
+
+
+
+insmod:
+	sudo insmod $(MODULE_NAME).ko
+
+reinsmod:
+	sudo rmmod $(MODULE_NAME)
+	sudo insmod $(MODULE_NAME).ko
+
+github:
+	cd $(ROOT) && make github
+
+rmmod:
+	sudo rmmod $(MODULE_NAME)
+
+test :
+	cat /sys/kernel/debug/mydebug/a
+	cat /sys/kernel/debug/mydebug/b
+	cat /sys/kernel/debug/mydebug/subdir/c
+
 clean:
 	make -C $(KERNELDIR) M=$(PWD) clean
-	rm -rf ./test
+	rm -f modules.order Module.symvers Module.markers
+
+.PHNOY:
+	modules modules_install clean
+
+
 
 endif
+

study/debug/filesystem/procfs/00-code/seq_file_exam/seq_file_exam.c

@@ -7,10 +7,12 @@
 
 #include <linux/percpu.h>
 #include <linux/sched.h>
-
+#include <linux/version.h>
 
 
 static struct proc_dir_entry *entry;
+#define PROC_NAME   "exam_seq_file"
+
 
 static void *l_start(struct seq_file *m, loff_t * pos)
 {
@@ -71,17 +73,29 @@ static struct file_operations exam_seq_fops = {
 
 static int __init exam_seq_init(void)
 {
-
-    entry = create_proc_entry("exam_esq_file", 0666, NULL);
-    if (entry)
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,4,0))
+    entry = proc_create(PROC_NAME, 0, NULL, &exam_seq_fops);
+#else
+    entry = create_proc_entry(PROC_NAME, 0666, NULL);
+    if (entry != NULL)
         entry->proc_fops = &exam_seq_fops;
+#endif
+
+    if(entry == NULL)
+    {
+        remove_proc_entry(PROC_NAME, NULL);
+        printk(KERN_DEBUG "Error: Could not initialize /proc/%s\n", PROC_NAME);
+        return -ENOMEM;
+    }
 
     return 0;
 }
 
 static void __exit exam_seq_exit(void)
 {
-    remove_proc_entry("exam_esq_file", NULL);
+    remove_proc_entry(PROC_NAME, NULL);
+    printk(KERN_DEBUG "/proc/%s removed\n", PROC_NAME);
+
 }
 
 module_init(exam_seq_init);

study/debug/modules/oops/README.md

@@ -34,6 +34,8 @@
 
 [WiKipedia](https://en.wikipedia.org/wiki/Linux_kernel_oops)
 
+[Oops中的error code解释](http://blog.csdn.net/mozun1/article/details/53306714)
+
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 <br>
 本作品采用<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议</a>进行许可