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authorLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 21:57:02 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 21:57:02 +0400
commit5fd29d6ccbc98884569d6f3105aeca70858b3e0f (patch)
tree93ac507debc6b35e5863116086c57170618099cf
parent03347e2592078a90df818670fddf97a33eec70fb (diff)
downloadlinux-5fd29d6ccbc98884569d6f3105aeca70858b3e0f.tar.xz
printk: clean up handling of log-levels and newlines
It used to be that we would only look at the log-level in a printk() after explicit newlines, which can cause annoying problems when the previous printk() did not end with a '\n'. In that case, the log-level marker would be just printed out in the middle of the line, and be seen as just noise rather than change the logging level. This changes things to always look at the log-level in the first bytes of the printout. If a log level marker is found, it is always used as the log-level. Additionally, if no newline existed, one is added (unless the log-level is the explicit KERN_CONT marker, to explicitly show that it's a continuation of a previous line). Acked-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/kernel.h2
-rw-r--r--kernel/printk.c31
2 files changed, 23 insertions, 10 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 883cd44ff765..066bb1eddfea 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -102,7 +102,7 @@ extern const char linux_proc_banner[];
* 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 ""
+#define KERN_CONT "<c>"
extern int console_printk[];
diff --git a/kernel/printk.c b/kernel/printk.c
index 5052b5497c67..a87770ce73a2 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -687,20 +687,33 @@ asmlinkage int vprintk(const char *fmt, va_list args)
sizeof(printk_buf) - printed_len, fmt, args);
+ p = printk_buf;
+
+ /* Do we have a loglevel in the string? */
+ if (p[0] == '<') {
+ unsigned char c = p[1];
+ if (c && p[2] == '>') {
+ switch (c) {
+ case '0' ... '7': /* loglevel */
+ current_log_level = c - '0';
+ if (!new_text_line) {
+ emit_log_char('\n');
+ new_text_line = 1;
+ }
+ /* Fallthrough - skip the loglevel */
+ case 'c': /* KERN_CONT */
+ p += 3;
+ break;
+ }
+ }
+ }
+
/*
* Copy the output into log_buf. If the caller didn't provide
* appropriate log level tags, we insert them here
*/
- for (p = printk_buf; *p; p++) {
+ for ( ; *p; p++) {
if (new_text_line) {
- /* If a token, set current_log_level and skip over */
- if (p[0] == '<' && p[1] >= '0' && p[1] <= '7' &&
- p[2] == '>') {
- current_log_level = p[1] - '0';
- p += 3;
- printed_len -= 3;
- }
-
/* Always output the token */
emit_log_char('<');
emit_log_char(current_log_level + '0');