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>
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@ -1,22 +1,25 @@
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#ifndef __KERN_LEVELS_H__
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#define __KERN_LEVELS_H__
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#define KERN_EMERG "<0>" /* system is unusable */
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#define KERN_ALERT "<1>" /* action must be taken immediately */
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#define KERN_CRIT "<2>" /* critical conditions */
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#define KERN_ERR "<3>" /* error conditions */
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#define KERN_WARNING "<4>" /* warning conditions */
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#define KERN_NOTICE "<5>" /* normal but significant condition */
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#define KERN_INFO "<6>" /* informational */
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#define KERN_DEBUG "<7>" /* debug-level messages */
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#define KERN_SOH "\001" /* ASCII Start Of Header */
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#define KERN_SOH_ASCII '\001'
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#define KERN_EMERG KERN_SOH "0" /* system is unusable */
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#define KERN_ALERT KERN_SOH "1" /* action must be taken immediately */
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#define KERN_CRIT KERN_SOH "2" /* critical conditions */
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#define KERN_ERR KERN_SOH "3" /* error conditions */
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#define KERN_WARNING KERN_SOH "4" /* warning conditions */
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#define KERN_NOTICE KERN_SOH "5" /* normal but significant condition */
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#define KERN_INFO KERN_SOH "6" /* informational */
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#define KERN_DEBUG KERN_SOH "7" /* debug-level messages */
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#define KERN_DEFAULT KERN_SOH "d" /* the default kernel loglevel */
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/* Use the default kernel loglevel */
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#define KERN_DEFAULT "<d>"
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/*
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* Annotation for a "continued" line of log printout (only done after a
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* line that had no enclosing \n). Only to be used by core/arch code
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* during early bootup (a continued line is not SMP-safe otherwise).
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*/
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#define KERN_CONT "<c>"
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#define KERN_CONT KERN_SOH "c"
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#endif
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@ -9,7 +9,7 @@ extern const char linux_proc_banner[];
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static inline int printk_get_level(const char *buffer)
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{
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if (buffer[0] == '<' && buffer[1] && buffer[2] == '>') {
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if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
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switch (buffer[1]) {
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case '0' ... '7':
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case 'd': /* KERN_DEFAULT */
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@ -27,7 +27,7 @@ static inline const char *printk_skip_level(const char *buffer)
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case '0' ... '7':
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case 'd': /* KERN_DEFAULT */
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case 'c': /* KERN_CONT */
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return buffer + 3;
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return buffer + 2;
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}
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}
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return buffer;
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