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rcuwait: avoid lockdep splats from rcuwait_active()

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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>
This commit is contained in:
Paolo Bonzini
2020-05-18 06:30:09 -04:00
parent cb953129bf
commit febd668d37
1 changed files with 1 additions and 1 deletions
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2
include/linux/rcuwait.h
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@@ -31,7 +31,7 @@ static inline void rcuwait_init(struct rcuwait *w)
*/ */
static inline int rcuwait_active(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); extern int rcuwait_wake_up(struct rcuwait *w);