On Wed, May 28, 2014 at 01:02:23PM -0700, Linus Torvalds wrote: > Anyway, one reason I looked at this is that most of the threads in > Mika's NMI watchdog traces were stuck on _raw_spin_lock() in the whole > d_walk() thing, and I had a *really* hard time convincing myself that > this was all safe without the RCU lock. I'm wondering if Mika perhaps > has CONFIG_PREEMPT_RCU set, which means that spinlocks (or the > rename_lock sequence lock) do not end up being RCU-safe points.
d_walk() covers its arse with ->d_lock (and it wants the starting point to be pinned, obviously). So AFAICS RCU is not a problem. -- 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/
