Signed-off-by: John Kacur 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-2.6.26.2-rt1-jk/kernel/Kconfig.preempt =================================================================== --- linux-2.6.26.2-rt1-jk.orig/kernel/Kconfig.preempt +++ linux-2.6.26.2-rt1-jk/kernel/Kconfig.preempt @@ -88,8 +88,10 @@ config PREEMPT config PREEMPT_SOFTIRQS bool "Thread Softirqs" +# PREEMPT_SOFTIRQS is visible only if !PREEMPT_RT +# However, PREEMPT_RT will set (select) PREEMPT_SOFTIRQS to y + depends on !PREEMPT_RT 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" +# PREEMPT_HARDIRQS is visible only if !PREEMPT_RT +# However, PREEMPT_RT will set 8select) PREEMPT_HARDIRQS to y + depends on !PREEMPT_RT 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