On Tue, Dec 02, 2014 at 03:30:44PM -0500, Dave Jones wrote:
> On Mon, Dec 01, 2014 at 12:36:34PM -0800, Linus Torvalds wrote:
> > On Mon, Dec 1, 2014 at 12:28 PM, Dâniel Fraga <frag...@gmail.com> wrote:
> > >
> > > Hi Paul. Please, I'd like the patch, because without
> > > preemption, I'm unable to trigger this bug.
> >
> > Ok, that's already interesting information. And yes, it would probably
> > be interesting to see if CONFIG_PREEMPT=y but !CONFIG_TREE_PREEMPT_RCU
> > then solves it too, to narrow it down to one but not the other..
>
> That combination doesn't seem possible. TREE_PREEMPT_RCU is the only
> possible choice if PREEMPT=y
Indeed, getting that combination requires a Kconfig patch, which I
supplied below. Not for mainline, debugging only.
Thanx, Paul
------------------------------------------------------------------------
diff --git a/init/Kconfig b/init/Kconfig
index 903505e66d1d..2cf71fcd514f 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -469,7 +469,7 @@ choice
config TREE_RCU
bool "Tree-based hierarchical RCU"
- depends on !PREEMPT && SMP
+ depends on SMP
select IRQ_WORK
help
This option selects the RCU implementation that is
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