lkml.org 
[lkml]   [2019]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] printk: add KERN_NOTIME to skip the timestamp
Date
Because log may already add the timestamp sometime

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
---
include/linux/kern_levels.h | 2 ++
include/linux/printk.h | 1 +
kernel/printk/printk.c | 7 ++++++-
3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/kern_levels.h b/include/linux/kern_levels.h
index d237fe8..ed2aec6 100644
--- a/include/linux/kern_levels.h
+++ b/include/linux/kern_levels.h
@@ -23,6 +23,8 @@
*/
#define KERN_CONT KERN_SOH "c"

+#define KERN_NOTIME KERN_SOH "t" /* don't print the timestamp */
+
/* integer equivalents of KERN_<LEVEL> */
#define LOGLEVEL_SCHED -2 /* Deferred messages from sched code
* are set to this special level */
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 77740a5..be12ac4 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -20,6 +20,7 @@ static inline int printk_get_level(const char *buffer)
case '0' ... '7':
case 'd': /* KERN_DEFAULT */
case 'c': /* KERN_CONT */
+ case 't': /* KERN_NOTIME */
return buffer[1];
}
}
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index d3d1703..0688cf2 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -346,6 +346,7 @@ enum log_flags {
LOG_NEWLINE = 2, /* text ended with a newline */
LOG_PREFIX = 4, /* text started with a prefix */
LOG_CONT = 8, /* text is a fragment of a continuation line */
+ LOG_NOTIME = 16, /* don't print the timestamp */
};

struct printk_log {
@@ -1247,7 +1248,7 @@ static size_t print_prefix(const struct printk_log *msg, bool syslog,

if (syslog)
len = print_syslog((msg->facility << 3) | msg->level, buf);
- if (time)
+ if (time && !(msg->flags & LOG_NOTIME))
len += print_time(msg->ts_nsec, buf + len);
return len;
}
@@ -1873,6 +1874,10 @@ int vprintk_store(int facility, int level,
break;
case 'c': /* KERN_CONT */
lflags |= LOG_CONT;
+ break;
+ case 't': /* KERN_NOTIME */
+ lflags |= LOG_NOTIME;
+ break;
}

text_len -= 2;
--
2.7.4
\
 
 \ /
  Last update: 2019-02-12 19:11    [W:0.061 / U:0.532 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site