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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.

Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: Alex Naidis <alex.naidis@linux.com>
(cherry picked from commit 9ec68f89188e461721de418545e31f37800dfa02)
(cherry picked from commit 8fb7e59ccd6cda94e29af9e6e38a96eda458c9da)
(cherry picked from commit 515ff4ab9e2428b642fcd158af94c83e3059b33b)
(cherry picked from commit ac9a6d9d6a744a11c49e9d756bd0229c912b773d)
(cherry picked from commit e4f4c2c3e696ab4135e5e63b2acae6400476ac35)
Signed-off-by: SirRGB <sirrgb@proton.me>
This commit is contained in:
Park Ju Hyung 2016-12-31 05:07:17 +09:00 • committed by Ksawlii
parent 613ee071be
commit 51cd5d4626
2 changed files with 18 additions and 0 deletions
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4
include/linux/kernel.h
View file

@ -593,6 +593,9 @@ 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__)); \
@ -615,6 +618,7 @@ 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

@ -149,6 +149,20 @@ 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: