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trace: add CONFIG_DISABLE_TRACE_PRINTK option

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Poorly made kernel trees often use trace_printk() without
properly guarding them in a #ifdef macro.
Such usage of trace_printk() causes a warning at
boot and additional memory allocation.

This option serves to disable those all at once with ease.

Change-Id: I2cb2085f48064bda8c18806597c5aee57237dca6
Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: Alex Naidis <alex.naidis@linux.com>
This commit is contained in:
Park Ju Hyung 2016-12-31 05:07:17 +09:00 committed by prashantpaddune
parent 1d45edeb90
commit 064c557846
2 changed files with 18 additions and 0 deletions
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4
include/linux/kernel.h
View File

@ -605,6 +605,9 @@ do { \
* let gcc optimize the rest. * let gcc optimize the rest.
*/ */
#ifdef CONFIG_DISABLE_TRACE_PRINTK
#define trace_printk pr_debug
#else
#define trace_printk(fmt, ...) \ #define trace_printk(fmt, ...) \
do { \ do { \
char _______STR[] = __stringify((__VA_ARGS__)); \ char _______STR[] = __stringify((__VA_ARGS__)); \
@ -627,6 +630,7 @@ do { \
else \ else \
__trace_printk(_THIS_IP_, fmt, ##args); \ __trace_printk(_THIS_IP_, fmt, ##args); \
} while (0) } while (0)
#endif
extern __printf(2, 3) extern __printf(2, 3)
int __trace_bprintk(unsigned long ip, const char *fmt, ...); int __trace_bprintk(unsigned long ip, const char *fmt, ...);

14
kernel/trace/Kconfig
View File

@ -111,6 +111,20 @@ config GENERIC_TRACER
bool bool
select TRACING select TRACING
if TRACING
config DISABLE_TRACE_PRINTK
bool "Force disable trace_printk() usage"
default y
help
When trace_printk() is used in any of the kernel source, it enables
debugging functions which are not desired for production kernel.
Enabling this option will replace trace_printk() with pr_debug().
If in doubt, say Y.
endif
# #
# Minimum requirements an architecture has to meet for us to # Minimum requirements an architecture has to meet for us to
# be able to offer generic tracing facilities: # be able to offer generic tracing facilities: