lkml.org 
[lkml]   [2011]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/3] rcu: Drive configuration directly from SMP and PREEMPT
Date
From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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>

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
--
1.7.2.3


\
 
 \ /
  Last update: 2011-11-19 13:53    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site