diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-05-18 06:30:09 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-05-20 03:39:40 -0400 |
| commit | febd668d375caf13a7fcd93b3498366854de854a (patch) | |
| tree | 510cec1c499c48e3e40076945d7a4f9156883c04 | |
| parent | cb953129bfe5c0f2da835a0469930873fb7e71df (diff) | |
rcuwait: avoid lockdep splats from rcuwait_active()
rcuwait_active only returns whether w->task is not NULL. This is
exactly one of the usecases that are mentioned in the documentation
for rcu_access_pointer() where it is correct to bypass lockdep checks.
This avoids a splat from kvm_vcpu_on_spin().
Reported-by: Wanpeng Li <kernellwp@gmail.com>
Tested-by: Wanpeng Li <kernellwp@gmail.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | include/linux/rcuwait.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h index c1414ce44abc..61c56cca95c4 100644 --- a/include/linux/rcuwait.h +++ b/include/linux/rcuwait.h @@ -31,7 +31,7 @@ static inline void rcuwait_init(struct rcuwait *w) */ static inline int rcuwait_active(struct rcuwait *w) { - return !!rcu_dereference(w->task); + return !!rcu_access_pointer(w->task); } extern int rcuwait_wake_up(struct rcuwait *w); |