Hello, Ingo,
Paul Gortmaker found some problems with no-CBs-CPU support in 3.8
mainline, and kindly supplied fixes. The first problem is soft-lockup
complaints that can occur on systems running with no-CBs CPUs that have
long periods of time where RCU is completely idle, which can happen on
some embedded systems. The second problem is a documentation error
for the "rcutree.rcu_nocb_poll" boot parameter. In this case, Paul Gortmaker
(rightly) noted that the need for "rcutree." was inconsistent with the
"rcu_nocbs=<cpumap>" boot parameter. The fix therefore to make the boot
parameter named "rcu_nocb_poll".
These problems only affect kernels built with the new CONFIG_RCU_NOCB_CPU
kernel parameter, but still should be fixed.
These fixes are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/urgent
Thanx, Paul
------------------>
Paul Gortmaker (2):
rcu: Prevent soft-lockup complaints about no-CBs CPUs
rcu: Make rcu_nocb_poll an early_param instead of module_param
Documentation/kernel-parameters.txt | 2 +-
kernel/rcutree_plugin.h | 13 ++++++++++---
2 files changed, 11 insertions(+), 4 deletions(-)
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