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locking: Enable RT_MUTEXES by default on PREEMPT_RT. 

The CONFIG_RT_MUTEXES option is enabled by CONFIG_FUTEX and CONFIG_I2C.
If both are disabled then a CONFIG_PREEMPT_RT build fails to compile.
It is not possible to have a PREEMPT_RT kernel without RT_MUTEX support
because RT_MUTEX based locking is always used.

Enable CONFIG_RT_MUTEXES by default on PREEMPT_RT builds.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/YgKmhjkcuqWXdUjQ@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2022-02-08 18:21:10 +01:00 committed by Peter Zijlstra
parent 9983a9d577
commit 1c6f9ec009
1 changed files with 1 additions and 0 deletions
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init/Kconfig
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@ -2054,6 +2054,7 @@ source "arch/Kconfig"
config RT_MUTEXES
bool
default y if PREEMPT_RT
config BASE_SMALL
int