Commit 8008e129 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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




config TREE_PREEMPT_RCU

config TREE_PREEMPT_RCU

	bool "Preemptible tree-based hierarchical RCU"

	bool "Preemptible tree-based hierarchical RCU"

	depends on PREEMPT

	depends on PREEMPT && SMP

	help

	help

	  This option selects the RCU implementation that is

	  This option selects the RCU implementation that is

	  designed for very large SMP systems with hundreds or

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




config TINY_RCU

config TINY_RCU

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

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

	depends on !SMP

	depends on !PREEMPT && !SMP

	help

	help

	  This option selects the RCU implementation that is

	  This option selects the RCU implementation that is

	  designed for UP systems from which real-time response

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




config TINY_PREEMPT_RCU

config TINY_PREEMPT_RCU

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

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

	depends on !SMP && PREEMPT

	depends on PREEMPT && !SMP

	help

	help

	  This option selects the RCU implementation that is designed

	  This option selects the RCU implementation that is designed

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

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

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