Prepare for the LinuxKernel tour

Prepare for the LinuxKernel journey-general Linux technology-Linux programming and kernel information. The following is a detailed description. Create a debug header file debug_if.h in include \ linux.

In include \ linux \ kernel. h, debug_if.h is included in kernel. h, which facilitates

You can directly use your own macro in the kernel.

# Ifndef _ DEBUG_IF_H __
# Define _ DEBUG_IF_H __

# Define _ SDEBUG_OUT_ENABLE _ 1
# Define _ SDEBUG_DETAIL _ 1

# If _ SDEBUG_OUT_ENABLE _ = 1
Extern int printk (const char * fmt ,...);

# If _ SDEBUG_DETAIL _ = 0
# Define PLINE printk ("[LJH] <% s: % d> enter_now \ n", _ FILE __, _ func __, _ LINE __)

# Define trace_l133 (fmt ,...) printk ("[LMT] <% s: % d>" fmt, _ FILE __, _ func __, _ LINE __, _ VA_ARGS __)

# Else
# Define PLINE {\
Static unsigned short cnt = 0 ;\
Printk ("[lsung] <% s: % d> enter_now \ n", _ FILE __, _ func __, _ LINE __, ++ cnt );}

# Define trace_l133 (fmt ,...){\
Static unsigned short cnt = 0 ;\
Printk ("[LMT] <% s: % d>" fmt, _ FILE __, _ func __, _ LINE __, ++ cnt, _ VA_ARGS __);}

# Endif

# Else
# Define PLINE
# Define trace_l133 (fmt ,...)

# Endif/* _ SDEBUG_OUT_ENABLE _*/

# Endif/* _ DEBUG_IF_H __*/