Commit 31f6d9d6 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
Browse files

[PATCH] Add printk_clock()

ia64's sched_clock() accesses per-cpu data which isn't set up at boot time.
Hence ia64 cannot use printk timestamping, because printk() will crash in

So make printk() use printk_clock(), defaulting to sched_clock(), overrideable
by the architecture via attribute(weak).

Cc: "Luck, Tony" <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 66dcca06
......@@ -488,6 +488,11 @@ static int __init printk_time_setup(char *str)
__setup("time", printk_time_setup);
__attribute__((weak)) unsigned long long printk_clock(void)
return sched_clock();
* This is printk. It can be called from any context. We want it to work.
......@@ -565,7 +570,7 @@ asmlinkage int vprintk(const char *fmt, va_list args)
loglev_char = default_message_loglevel
+ '0';
t = sched_clock();
t = printk_clock();
nanosec_rem = do_div(t, 1000000000);
tlen = sprintf(tbuf,
"<%c>[%5lu.%06lu] ",
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