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rcu: Drive configuration directly from SMP and PREEMPT

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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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2011-06-08 16:31:33 -07:00
parent b15a2e7d16
commit 8008e129dc
1 changed files with 3 additions and 3 deletions
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6
init/Kconfig
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@ -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