The modification of PF_IDLE semantics lately to fix a bug in rcutiny eventually introduced new bugs in RCU-tasks. This series revert that PF_IDLE modification and fix rcutiny in an alternate way. More issues need to be fixed in RCU-tasks: * The boot code preceding the idle entry is included in this quiescent state. Especially after the completion of kthreadd_done after which init/1 can launch userspace concurrently. The window is tiny before PF_IDLE is set but it exists. * Similarly, the boot code preceding the idle entry on secondary CPUs is wrongly accounted as RCU tasks quiescent state. And those will be fixed separetely. Frederic Weisbecker (4): softirq: Rename __raise_softirq_irqoff() to raise_softirq_no_wake() softirq: Introduce raise_ksoftirqd_irqoff() rcu: Make tiny RCU use ksoftirqd to trigger a QS from idle Revert "kernel/sched: Modify initial boot task idle setup" block/blk-mq.c | 2 +- include/linux/interrupt.h | 3 ++- kernel/rcu/tiny.c | 21 +++++++++++++----- kernel/sched/core.c | 2 +- kernel/sched/idle.c | 1 - kernel/softirq.c | 45 +++++++++++++++++++++++++-------------- lib/irq_poll.c | 4 ++-- net/core/dev.c | 8 +++---- 8 files changed, 55 insertions(+), 31 deletions(-) -- 2.34.1
