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authorPaolo Bonzini <pbonzini@redhat.com>2020-05-18 06:30:09 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2020-05-20 03:39:40 -0400
commitfebd668d375caf13a7fcd93b3498366854de854a (patch)
tree510cec1c499c48e3e40076945d7a4f9156883c04 /include/linux/rcuwait.h
parentcb953129bfe5c0f2da835a0469930873fb7e71df (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>
Diffstat (limited to 'include/linux/rcuwait.h')
-rw-r--r--include/linux/rcuwait.h2
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);