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rcu: Make RCU able to tolerate undefined CONFIG_RCU_KTHREAD_PRIO

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This commit updates the initialization of the kthread_prio boot parameter
so that RCU will build even when CONFIG_RCU_KTHREAD_PRIO is undefined.
The kthread_prio boot parameter is set to CONFIG_RCU_KTHREAD_PRIO if
that is defined, otherwise to 1 if CONFIG_RCU_BOOST is defined and
to zero otherwise.  This commit then makes CONFIG_RCU_KTHREAD_PRIO
depend on CONFIG_RCU_EXPERT, so that Kconfig users won't be asked about
CONFIG_RCU_KTHREAD_PRIO unless they want to be.

Reported-by: Linus Torvalds <[email protected]>
Reported-by: Ingo Molnar <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Pranith Kumar <[email protected]>
This commit is contained in:
Paul E. McKenney 2015-04-21 09:22:14 -07:00
commit 26730f55c2
2 changed files with 5 additions and 0 deletions
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init/Kconfig
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@ -671,6 +671,7 @@ config RCU_KTHREAD_PRIO
range 0 99 if !RCU_BOOST
default 1 if RCU_BOOST
default 0 if !RCU_BOOST
depends on RCU_EXPERT
help
This option specifies the SCHED_FIFO priority value that will be
assigned to the rcuc/n and rcub/n threads and is also the value