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printk() - restore timestamp printing at console output

Browse source 
The output of the timestamps got lost with the conversion of the
kmsg buffer to records; restore the old behavior.

Document, that CONFIG_PRINTK_TIME now only controls the output of
the timestamps in the syslog() system call and on the console, and
not the recording of the timestamps.

Cc: Joe Perches <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Sasha Levin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Reported-by: Yinghai Lu <[email protected]>
Signed-off-by: Kay Sievers <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Kay Sievers 2012-05-10 04:30:45 +02:00 • committed by Greg Kroah-Hartman
commit 649e6ee33f
2 changed files with 36 additions and 23 deletions
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43
kernel/printk.c
View file

@ -786,6 +786,22 @@ static bool printk_time;
#endif
module_param_named(time, printk_time, bool, S_IRUGO | S_IWUSR);
static size_t prepend_timestamp(unsigned long long t, char *buf)
{
unsigned long rem_ns;
if (!printk_time)
return 0;
if (!buf)
return 15;
rem_ns = do_div(t, 1000000000);
return sprintf(buf, "[%5lu.%06lu] ",
(unsigned long) t, rem_ns / 1000);
}
static int syslog_print_line(u32 idx, char *text, size_t size)
{
struct log *msg;
@ -800,9 +816,7 @@ static int syslog_print_line(u32 idx, char *text, size_t size)
len++;
if (msg->level > 99)
len++;
if (printk_time)
len += 15;
len += prepend_timestamp(0, NULL);
len += msg->text_len;
len++;
@ -810,15 +824,7 @@ static int syslog_print_line(u32 idx, char *text, size_t size)
}
len = sprintf(text, "<%u>", msg->level);
if (printk_time) {
unsigned long long t = msg->ts_nsec;
unsigned long rem_ns = do_div(t, 1000000000);
len += sprintf(text + len, "[%5lu.%06lu] ",
(unsigned long) t, rem_ns / 1000);
}
len += prepend_timestamp(msg->ts_nsec, text + len);
if (len + msg->text_len > size)
return -EINVAL;
memcpy(text + len, log_text(msg), msg->text_len);
@ -1741,7 +1747,7 @@ again:
for (;;) {
struct log *msg;
static char text[LOG_LINE_MAX];
size_t len;
size_t len, l;
int level;
raw_spin_lock_irqsave(&logbuf_lock, flags);
@ -1761,10 +1767,13 @@ again:
msg = log_from_idx(console_idx);
level = msg->level & 7;
len = msg->text_len;
if (len+1 >= sizeof(text))
len = sizeof(text)-1;
memcpy(text, log_text(msg), len);
len = prepend_timestamp(msg->ts_nsec, text);
l = msg->text_len;
if (len + l + 1 >= sizeof(text))
l = sizeof(text) - len - 1;
memcpy(text + len, log_text(msg), l);
len += l;
text[len++] = '\n';
console_idx = log_next(console_idx);