Open pr_debug of fixed files

Source: Internet
Author: User

Open pr_debug of fixed files

In the driver, pr_debug is defined in kernel/include/linux/printk. h.

/* If you are writing a driver, please usedev_dbg instead */


/* Dynamic_pr_debug () uses pr_fmt () internally so we don't need it here */

# Define pr_debug (fmt ,...)\

Dynamic_pr_debug (fmt, ##__ VA_ARGS __)

# Elif defined (DEBUG)

# Define pr_debug (fmt ,...)\

Printk (kern_debuupl_fmt (fmt), ##__ VA_ARGS __)

# Else

# Define pr_debug (fmt ,...)\

No_printk (kern_debuupl_fmt (fmt), ##__ VA_ARGS __)

# Endif

Add ccflag + y = -- ddebug to the makefile file.

Or dedicated macro control


All logs can be opened, but too many logs may cause system analysis inconvenience for multiple android files. To facilitate opening the log of the required module, I need to re-define in the file where the log needs to be opened.

#ifdef pr_debug#undef pr_debug#define pr_debug(fmt, ...) \printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)#else#define pr_debug(fmt, ...) \printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)#endif

In this way, the corresponding log in the source code can be debugged easily, avoiding the workload of opening one by one.

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