Hi Sebastian,It seems that commit 17cfc9697f5574e4b523c21fca160aac5a3ac6dc "softirq: Update the WIP" breaks builds without CONFIG_SMP, due to unresolved references to tasklet_unlock and tasklet_unlock_wait in softirq.c
In include/linux/interrupt.h the functions are declared if either CONFIG_SMP or CONFIG_PREEMPT_RT are defined.
However, in softirq.c the functions are now only in an #ifdef CONFIG_SMP block.
Regards Jonathan Schwender
