Subject: rcu self-detected stall messages on OMAP3, 4 boards

From: [email-masked] (Tony Lindgren)
Date: Fri, 21 Sep 2012 13:31:49 -0700

* Paul E. McKenney <[email-masked]> [120921 12:58]:
> 
> Just to make sure I understand the combinations:
> 
> o	All stalls have happened when running a minimal userspace.
> o	CONFIG_NO_HZ=n suppresses the stalls.
> o	CONFIG_RCU_FAST_NO_HZ (which depends on CONFIG_NO_HZ=y) has
> 	no observable effect on the stalls.

The reason why you may need minimal userspace is to cut down
the number of timers waking up the system with NO_HZ.
Booting with init=/bin/sh might also do the trick for that.

Regards,

Tony