tree dffce93d8da097a4701bfdafe4c23323371cd899
parent 8739c5cb0fb145aeed8c56ddb5ba79381c74cb97
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1429565263 -0700
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1432756745 -0700

rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUT

This commit introduces an RCU_FANOUT C-preprocessor macro so that RCU will
build even when CONFIG_RCU_FANOUT is undefined.  The RCU_FANOUT macro is
set to the value of CONFIG_RCU_FANOUT when defined, otherwise it is set
to 32 for 32-bit systems and 64 for 64-bit systems.  This commit then
makes CONFIG_RCU_FANOUT depend on CONFIG_RCU_EXPERT, so that Kconfig
users won't be asked about CONFIG_RCU_FANOUT unless they want to be.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Pranith Kumar <bobby.prani@gmail.com>