This is a non-critical patch, that makes configuring an rt kernel a
little nicer.
Comments are welcome of course.
Signed-off-by: John Kacur <jkacur at gmail dot com>
This patch makes the following changes.
1. Hides the visibility of PREEMPT_SOFTIRQS and PREEMPT_HARDIRQS if PREEMPT_RT
(Complete Preemption) is choosen, since these values are then set (selected) to
be "y".
2. Changes the PREEMPT_HARDIRQS to depend on PREEMPT_SOFTIRQS instead of
forcing PREEMPT_SOFTIRQS to y if PREEMPT_HARDIRQS is choosen. (this is somewhat
an abuse of select)
3. Minor spelling fix. (tat to that)
Signed-off-by: John Kacur <jkacur at gmail dot com>
This patch makes the following changes.
1. Hides the visibility of PREEMPT_SOFTIRQS and PREEMPT_HARDIRQS if PREEMPT_RT
(Complete Preemption) is choosen, since these values are then set (selected) to
be "y".
2. Changes the PREEMPT_HARDIRQS to depend on PREEMPT_SOFTIRQS instead of
forcing PREEMPT_SOFTIRQS to y if PREEMPT_HARDIRQS is choosen. (this is somewhat
an abuse of select)
3. Minor spelling fix. (tat to that)
Index: linux-2.6.26-rt1/kernel/Kconfig.preempt
===================================================================
--- linux-2.6.26-rt1.orig/kernel/Kconfig.preempt
+++ linux-2.6.26-rt1/kernel/Kconfig.preempt
@@ -88,8 +88,10 @@ config PREEMPT
config PREEMPT_SOFTIRQS
bool "Thread Softirqs"
+# The following line makes PREEMPT_SOFTIRQS invisible if PREEMPT_RT is y
+# However, PREEMPT_RT still sets (selects) the value of PREEMPT_SOFTIRQS to y
+ depends on PREEMPT_RT != y
default n
-# depends on PREEMPT
help
This option reduces the latency of the kernel by 'threading'
soft interrupts. This means that all softirqs will execute
@@ -104,9 +106,12 @@ config PREEMPT_SOFTIRQS
config PREEMPT_HARDIRQS
bool "Thread Hardirqs"
+# The following line makes PREEMPT_HARDIRQS invisible if PREEMPT_RT is y
+# However, PREEMPT_RT still sets (selects) the value of PREEMPT_HARDIRQS to y
+ depends on PREEMPT_RT != y
default n
depends on !GENERIC_HARDIRQS_NO__DO_IRQ
- select PREEMPT_SOFTIRQS
+ depends on PREEMPT_SOFTIRQS
help
This option reduces the latency of the kernel by 'threading'
hardirqs. This means that all (or selected) hardirqs will run
@@ -141,7 +146,7 @@ config PREEMPT_RCU_BOOST
default y if PREEMPT_RT
help
This option permits priority boosting of RCU read-side critical
- sections tat have been preempted and a RT process is waiting
+ sections that have been preempted and a RT process is waiting
on a synchronize_rcu.
An RCU thread is also created that periodically wakes up and
