diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2009-08-22 16:56:53 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-23 04:32:40 -0400 |
| commit | 6b3ef48adf847f7adf11c870e3ffacac150f1564 (patch) | |
| tree | e1403ce515bf00ade99ec806f6ab6b6db999aa0b /Documentation/RCU/rcu.txt | |
| parent | f41d911f8c49a5d65c86504c19e8204bb605c4fd (diff) | |
rcu: Remove CONFIG_PREEMPT_RCU
Now that CONFIG_TREE_PREEMPT_RCU is in place, there is no
further need for CONFIG_PREEMPT_RCU. Remove it, along with
whatever subtle bugs it may (or may not) contain.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: josht@linux.vnet.ibm.com
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
LKML-Reference: <125097461396-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/RCU/rcu.txt')
| -rw-r--r-- | Documentation/RCU/rcu.txt | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/RCU/rcu.txt b/Documentation/RCU/rcu.txt index 7aa2002ade77..2a23523ce471 100644 --- a/Documentation/RCU/rcu.txt +++ b/Documentation/RCU/rcu.txt | |||
| @@ -36,7 +36,7 @@ o How can the updater tell when a grace period has completed | |||
| 36 | executed in user mode, or executed in the idle loop, we can | 36 | executed in user mode, or executed in the idle loop, we can |
| 37 | safely free up that item. | 37 | safely free up that item. |
| 38 | 38 | ||
| 39 | Preemptible variants of RCU (CONFIG_PREEMPT_RCU) get the | 39 | Preemptible variants of RCU (CONFIG_TREE_PREEMPT_RCU) get the |
| 40 | same effect, but require that the readers manipulate CPU-local | 40 | same effect, but require that the readers manipulate CPU-local |
| 41 | counters. These counters allow limited types of blocking | 41 | counters. These counters allow limited types of blocking |
| 42 | within RCU read-side critical sections. SRCU also uses | 42 | within RCU read-side critical sections. SRCU also uses |
| @@ -79,10 +79,10 @@ o I hear that RCU is patented? What is with that? | |||
| 79 | o I hear that RCU needs work in order to support realtime kernels? | 79 | o I hear that RCU needs work in order to support realtime kernels? |
| 80 | 80 | ||
| 81 | This work is largely completed. Realtime-friendly RCU can be | 81 | This work is largely completed. Realtime-friendly RCU can be |
| 82 | enabled via the CONFIG_PREEMPT_RCU kernel configuration parameter. | 82 | enabled via the CONFIG_TREE_PREEMPT_RCU kernel configuration |
| 83 | However, work is in progress for enabling priority boosting of | 83 | parameter. However, work is in progress for enabling priority |
| 84 | preempted RCU read-side critical sections. This is needed if you | 84 | boosting of preempted RCU read-side critical sections. This is |
| 85 | have CPU-bound realtime threads. | 85 | needed if you have CPU-bound realtime threads. |
| 86 | 86 | ||
| 87 | o Where can I find more information on RCU? | 87 | o Where can I find more information on RCU? |
| 88 | 88 | ||