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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-06-08 16:31:33 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-09-28 21:36:45 -0700 |
| commit | 8008e129dc90ff4f7a56cb033d6bd042afe3ed52 (patch) | |
| tree | b9ecf70a2fe6eb1f64368ada9f45af62f0cae519 /init | |
| parent | b15a2e7d16cc6f6082d8c6a85349e48588763ffc (diff) | |
| download | lwn-8008e129dc90ff4f7a56cb033d6bd042afe3ed52.tar.gz lwn-8008e129dc90ff4f7a56cb033d6bd042afe3ed52.zip | |
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: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig index d62778390e55..dc7e27bf89a8 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -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 |