diff options
| author | Joe Perches <joe@perches.com> | 2012-07-30 14:40:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-30 17:25:14 -0700 |
| commit | 04d2c8c83d0e3ac5f78aeede51babb3236200112 (patch) | |
| tree | c32b6197f9487cc18f00e85bdfb935a7a6a92477 /include/linux/kern_levels.h | |
| parent | b778b3f25baf46dd88f16d51f1682828be0aa2ad (diff) | |
| download | lwn-04d2c8c83d0e3ac5f78aeede51babb3236200112.tar.gz lwn-04d2c8c83d0e3ac5f78aeede51babb3236200112.zip | |
printk: convert the format for KERN_<LEVEL> to a 2 byte pattern
Instead of "<.>", use an ASCII SOH for the KERN_<LEVEL> prefix initiator.
This saves 1 byte per printk, thousands of bytes in a normal kernel.
No output changes are produced as vprintk_emit converts these uses to
"<.>".
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/kern_levels.h')
| -rw-r--r-- | include/linux/kern_levels.h | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/include/linux/kern_levels.h b/include/linux/kern_levels.h index 337e56ff5332..8c719a955b5b 100644 --- a/include/linux/kern_levels.h +++ b/include/linux/kern_levels.h @@ -1,22 +1,25 @@ #ifndef __KERN_LEVELS_H__ #define __KERN_LEVELS_H__ -#define KERN_EMERG "<0>" /* system is unusable */ -#define KERN_ALERT "<1>" /* action must be taken immediately */ -#define KERN_CRIT "<2>" /* critical conditions */ -#define KERN_ERR "<3>" /* error conditions */ -#define KERN_WARNING "<4>" /* warning conditions */ -#define KERN_NOTICE "<5>" /* normal but significant condition */ -#define KERN_INFO "<6>" /* informational */ -#define KERN_DEBUG "<7>" /* debug-level messages */ +#define KERN_SOH "\001" /* ASCII Start Of Header */ +#define KERN_SOH_ASCII '\001' + +#define KERN_EMERG KERN_SOH "0" /* system is unusable */ +#define KERN_ALERT KERN_SOH "1" /* action must be taken immediately */ +#define KERN_CRIT KERN_SOH "2" /* critical conditions */ +#define KERN_ERR KERN_SOH "3" /* error conditions */ +#define KERN_WARNING KERN_SOH "4" /* warning conditions */ +#define KERN_NOTICE KERN_SOH "5" /* normal but significant condition */ +#define KERN_INFO KERN_SOH "6" /* informational */ +#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */ + +#define KERN_DEFAULT KERN_SOH "d" /* the default kernel loglevel */ -/* Use the default kernel loglevel */ -#define KERN_DEFAULT "<d>" /* * Annotation for a "continued" line of log printout (only done after a * line that had no enclosing \n). Only to be used by core/arch code * during early bootup (a continued line is not SMP-safe otherwise). */ -#define KERN_CONT "<c>" +#define KERN_CONT KERN_SOH "c" #endif |