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authorValentin Schneider <valentin.schneider@arm.com>2021-05-10 18:10:23 +0300
committerPeter Zijlstra <peterz@infradead.org>2021-05-18 13:53:53 +0300
commit00b89fe0197f0c55a045775c11553c0cdb7082fe (patch)
tree242f776a1460b80467564ed1156eeacc212dac27 /include/linux/kthread.h
parentfcb501704554eebfd27e3220b0540997fd2b24a8 (diff)
downloadlinux-00b89fe0197f0c55a045775c11553c0cdb7082fe.tar.xz
sched: Make the idle task quack like a per-CPU kthread
For all intents and purposes, the idle task is a per-CPU kthread. It isn't created via the same route as other pcpu kthreads however, and as a result it is missing a few bells and whistles: it fails kthread_is_per_cpu() and it doesn't have PF_NO_SETAFFINITY set. Fix the former by giving the idle task a kthread struct along with the KTHREAD_IS_PER_CPU flag. This requires some extra iffery as init_idle() call be called more than once on the same idle task. Signed-off-by: Valentin Schneider <valentin.schneider@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210510151024.2448573-2-valentin.schneider@arm.com
Diffstat (limited to 'include/linux/kthread.h')
-rw-r--r--include/linux/kthread.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 2484ed97e72f..d9133d6db308 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -33,6 +33,8 @@ struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
unsigned int cpu,
const char *namefmt);
+void set_kthread_struct(struct task_struct *p);
+
void kthread_set_per_cpu(struct task_struct *k, int cpu);
bool kthread_is_per_cpu(struct task_struct *k);