* Ingo Molnar <mi...@kernel.org> wrote: > +static void csd_lock_wait(struct call_single_data *csd, int cpu) > { > - while (csd->flags & CSD_FLAG_LOCK) > + int bug_id = 0; > + u64 ts0, ts1, ts_delta; > + > + ts0 = jiffies_to_msecs(jiffies);
Note that while 'jiffies' is a global variable, it's read-mostly accessed, so it is a pretty cheap way to acquire a timestamp in such a simple polling context that has irqs enabled. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/