[PATCH 3/3] rcu: Drive configuration directly from SMP and PREEMPT
From: John Kacur <jkacur@redhat.com>
Date: 2011-11-19 12:50:48
Also in:
lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Paul E. McKenney <redacted> 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 <redacted> commit 8008e129dc90ff4f7a56cb033d6bd042afe3ed52 upstream Cherry-picked for v3.0-rt and fixed-up merge conflicts Note: This makes the depends lines for these options in init/Kconfig for v3.0-rt match those for v3.2-rc2-rt3 Signed-off-by: John Kacur <jkacur@redhat.com> --- init/Kconfig | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig
index 89e40a4..5c1147e 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 && !PREEMPT_RT_FULL + 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 && !PREEMPT_RT_FULL + depends on PREEMPT && !SMP help This option selects the RCU implementation that is designed for real-time UP systems. This option greatly reduces the
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