|author||Paul E. McKenney <email@example.com>||2012-10-19 12:49:17 -0700|
|committer||Paul E. McKenney <firstname.lastname@example.org>||2013-01-28 22:06:21 -0800|
rcu: Provide RCU CPU stall warnings for tiny RCU
Tiny RCU has historically omitted RCU CPU stall warnings in order to reduce memory requirements, however, lack of these warnings caused Thomas Gleixner some debugging pain recently. Therefore, this commit adds RCU CPU stall warnings to tiny RCU if RCU_TRACE=y. This keeps the memory footprint small, while still enabling CPU stall warnings in kernels built to enable them. Updated to include Josh Triplett's suggested use of RCU_STALL_COMMON config variable to simplify #if expressions. Reported-by: Thomas Gleixner <email@example.com> Signed-off-by: Paul E. McKenney <firstname.lastname@example.org> Signed-off-by: Paul E. McKenney <email@example.com> Reviewed-by: Josh Triplett <firstname.lastname@example.org>
Diffstat (limited to 'init')
1 files changed, 8 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 7d30240e5bf..a5e90e139ba 100644
@@ -486,6 +486,14 @@ config PREEMPT_RCU
This option enables preemptible-RCU code that is common between
the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations.
+ def_bool ( TREE_RCU || TREE_PREEMPT_RCU || RCU_TRACE )
+ This option enables RCU CPU stall code that is common between
+ the TINY and TREE variants of RCU. The purpose is to allow
+ the tiny variants to disable RCU CPU stall warnings, while
+ making these warnings mandatory for the tree variants.