diff options
| author | John Stultz <jstultz@google.com> | 2026-03-24 19:13:19 +0000 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-04-03 14:23:39 +0200 |
| commit | fa4a1ff8ab235a308d8c983827657a69649185fd (patch) | |
| tree | 832bd48a7c5f4e55fa33a3ffee76facc978838d5 /kernel/sched | |
| parent | f4fe6be82e6d27349de66a42d6d1b2b11dc97a14 (diff) | |
locking: Add task::blocked_lock to serialize blocked_on state
So far, we have been able to utilize the mutex::wait_lock
for serializing the blocked_on state, but when we move to
proxying across runqueues, we will need to add more state
and a way to serialize changes to this state in contexts
where we don't hold the mutex::wait_lock.
So introduce the task::blocked_lock, which nests under the
mutex::wait_lock in the locking order, and rework the locking
to use it.
Signed-off-by: John Stultz <jstultz@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://patch.msgid.link/20260324191337.1841376-5-jstultz@google.com
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 5b7f378af042..1913dbc68eb9 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6584,6 +6584,7 @@ static struct task_struct *proxy_deactivate(struct rq *rq, struct task_struct *d * p->pi_lock * rq->lock * mutex->wait_lock + * p->blocked_lock * * Returns the task that is going to be used as execution context (the one * that is actually going to be run on cpu_of(rq)). @@ -6603,8 +6604,9 @@ find_proxy_task(struct rq *rq, struct task_struct *donor, struct rq_flags *rf) * and ensure @owner sticks around. */ guard(raw_spinlock)(&mutex->wait_lock); + guard(raw_spinlock)(&p->blocked_lock); - /* Check again that p is blocked with wait_lock held */ + /* Check again that p is blocked with blocked_lock held */ if (mutex != __get_task_blocked_on(p)) { /* * Something changed in the blocked_on chain and |