Re: [patch] fix printk format typo in boot ftracer.

[Ingo Molnar <mingo@elte.hu>]

* Arjan van de Ven <arjan@infradead.org> wrote:

> On Sat, 4 Oct 2008 22:58:12 +0200
> "Frédéric Weisbecker" <fweisbec@gmail.com> wrote:
> 
> > > -               ret = trace_seq_printf(s, "[%5ld.%06ld] initcall %s
> > > "
> > > +               ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s
> > > " "returned %d after %lld msecs\n",
> > >                                          rettime.tv_sec,
> > >                                          rettime.tv_nsec,
> > 
> > I picked these formats from the printk.c time formatting. But you're
> > right, 09 would give us the whole nano precision.
> 
> it's more than precision, it's correctness.
> 
> doing "0.%02i" will do
> 0.100  if you pass it 100 and
> 0.10   if you pass it 10
> 
> and most off the time, except the first 0.1 seconds, you'll be passing
> it 9 digits, but the first 0.1 seconds.. the %06 will just give really
> incorrect results.

applied to tip/tracing/core, thanks!

	Ingo