diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-01-13 10:20:59 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-01-13 10:20:59 -0300 |
| commit | 1aa77e716c6f2332f2d4664f747ff4eba731825b (patch) | |
| tree | bffb043cec73da6c79d4ec652e531f86344b160b /kernel/locking/rtmutex.c | |
| parent | c0dd94558d0e473aa92254e1c48a47900c911e69 (diff) | |
| parent | 455e73a07f6e288b0061dfcf4fcf54fa9fe06458 (diff) | |
Merge remote-tracking branch 'torvalds/master' into perf/core
To pick up fixes and get in line with other trees, powerpc kernel
mostly this time, but BPF as well.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'kernel/locking/rtmutex.c')
| -rw-r--r-- | kernel/locking/rtmutex.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index 1f25a4d7de27..8555c4efe97c 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -1103,8 +1103,11 @@ static int __sched task_blocks_on_rt_mutex(struct rt_mutex_base *lock, * the other will detect the deadlock and return -EDEADLOCK, * which is wrong, as the other waiter is not in a deadlock * situation. + * + * Except for ww_mutex, in that case the chain walk must already deal + * with spurious cycles, see the comments at [3] and [6]. */ - if (owner == task) + if (owner == task && !(build_ww_mutex() && ww_ctx)) return -EDEADLK; raw_spin_lock(&task->pi_lock); @@ -1379,9 +1382,8 @@ static bool rtmutex_spin_on_owner(struct rt_mutex_base *lock, * for CONFIG_PREEMPT_RCU=y) * - the VCPU on which owner runs is preempted */ - if (!owner->on_cpu || need_resched() || - !rt_mutex_waiter_is_top_waiter(lock, waiter) || - vcpu_is_preempted(task_cpu(owner))) { + if (!owner_on_cpu(owner) || need_resched() || + !rt_mutex_waiter_is_top_waiter(lock, waiter)) { res = false; break; } |