Revert "kernel/sched: Modify initial boot task idle setup"

This reverts commit 3569ad59664f9fa3ba1d02a78810773b7f49702b which is
commit cff9b2332ab762b7e0586c793c431a8f2ea4db04 upstream.

Joel writes:
	Let us drop this patch because it caused new tasks-RCU warnings (both
	normal and rude tasks RCU) in my stable test rig. We are discussing
	the "right fix" and at that time a backport can be done.

Reported-by: Joel Fernandes <joel@joelfernandes.org>
Link: https://lore.kernel.org/r/CAEXW_YT6bH70M1TF2TttB-_kP=RUv_1nsy_sHYi6_0oCrX3mVQ@mail.gmail.com
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 02c91528127af21e7c267fe086804656b3c24be6..2324b7055260aedb14d4cf8e18369f81c0aee702 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8725,7 +8725,7 @@ void __init init_idle(struct task_struct *idle, int cpu)
         * PF_KTHREAD should already be set at this point; regardless, make it
         * look like a proper per-CPU kthread.
         */
-       idle->flags |= PF_KTHREAD | PF_NO_SETAFFINITY;
+       idle->flags |= PF_IDLE | PF_KTHREAD | PF_NO_SETAFFINITY;
        kthread_set_per_cpu(idle, cpu);
 
 #ifdef CONFIG_SMP

diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 6b8d2169d9ea48106a9d0e0a2b739869a7a63801..499a3e286cd05528802755df16269bc7563769eb 100644 (file)
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -397,7 +397,6 @@ EXPORT_SYMBOL_GPL(play_idle_precise);
 
 void cpu_startup_entry(enum cpuhp_state state)
 {
-       current->flags |= PF_IDLE;
        arch_cpu_idle_prepare();
        cpuhp_online_idle(state);
        while (1)