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Commit 8008e129 authored by Paul E. McKenney's avatar Paul E. McKenney
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rcu: Drive configuration directly from SMP and PREEMPT 



This commit eliminates the possibility of running TREE_PREEMPT_RCU
when SMP=n and of running TINY_RCU when PREEMPT=y.  People who really
want these combinations can hand-edit init/Kconfig, but eliminating
them as choices for production systems reduces the amount of testing
required.  It will also allow cutting out a few #ifdefs.

Note that running TREE_RCU and TINY_RCU on single-CPU systems using
SMP-built kernels is still supported.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent b15a2e7d

init/Kconfig

+3 −3
Original line number Diff line number Diff line
@@ -391,7 +391,7 @@ config TREE_RCU 


config TREE_PREEMPT_RCU

	bool "Preemptible tree-based hierarchical RCU"

	depends on PREEMPT

	depends on PREEMPT && SMP

	help

	  This option selects the RCU implementation that is

	  designed for very large SMP systems with hundreds or
@@ -401,7 +401,7 @@ config TREE_PREEMPT_RCU 


config TINY_RCU

	bool "UP-only small-memory-footprint RCU"

	depends on !SMP

	depends on !PREEMPT && !SMP

	help

	  This option selects the RCU implementation that is

	  designed for UP systems from which real-time response
@@ -410,7 +410,7 @@ config TINY_RCU 


config TINY_PREEMPT_RCU

	bool "Preemptible UP-only small-memory-footprint RCU"

	depends on !SMP && PREEMPT

	depends on PREEMPT && !SMP

	help

	  This option selects the RCU implementation that is designed

	  for real-time UP systems.  This option greatly reduces the