On Tue, 15 Jan 2008, Mathieu Desnoyers wrote: > > > > This patch simply initializes the clock to use clocksource_jiffies, so > > that any early user of clocksource_read will not crash. > > > > Hrm, is it sane at all to use the jiffies as a clocksource at early > boot? I thought it was updated by the timer interrupt, which is only > activated late in the boot process.
It gives us a bogus value, but we know it's always there. This was discovered in the -rt patch where we had a hard hang at early bootup. Seems that the tracer was calling for a clock source before it was initialized, and it called a null pointer. The original fix was to just make a dummy timer source that returned zero. But using jiffies seemed a better solution. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
