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[PATCH] Add printk_clock()

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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
sched_clock().

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

Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andrew Morton 2005-09-21 09:55:30 -07:00 committed by Linus Torvalds
parent 66dcca0628
commit 31f6d9d628
1 changed files with 6 additions and 1 deletions
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7
kernel/printk.c
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@ -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] ",