From: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> Fix the following false positive warnings: [ 9403.765413][T61744] ============================= [ 9403.786541][T61744] WARNING: suspicious RCU usage [ 9403.807865][T61744] 5.7.0-rc1-next-20200417 #4 Tainted: G L [ 9403.838945][T61744] ----------------------------- [ 9403.860099][T61744] arch/x86/kvm/mmu/page_track.c:257 RCU-list traversed in non-reader section!! and [ 9405.859252][T61751] ============================= [ 9405.859258][T61751] WARNING: suspicious RCU usage [ 9405.880867][T61755] ----------------------------- [ 9405.911936][T61751] 5.7.0-rc1-next-20200417 #4 Tainted: G L [ 9405.911942][T61751] ----------------------------- [ 9405.911950][T61751] arch/x86/kvm/mmu/page_track.c:232 RCU-list traversed in non-reader section!! Since srcu read lock is held, these are false positive warnings. Therefore, pass condition srcu_read_lock_held() to list_for_each_entry_rcu(). Reported-by: kernel test robot <lkp@xxxxxxxxx> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@xxxxxxxxx> --- arch/x86/kvm/mmu/page_track.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c index ddc1ec3bdacd..1ad79c7aa05b 100644 --- a/arch/x86/kvm/mmu/page_track.c +++ b/arch/x86/kvm/mmu/page_track.c @@ -229,7 +229,8 @@ void kvm_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new, return; idx = srcu_read_lock(&head->track_srcu); - hlist_for_each_entry_rcu(n, &head->track_notifier_list, node) + hlist_for_each_entry_rcu(n, &head->track_notifier_list, node, + srcu_read_lock_held(&head->track_srcu)) if (n->track_write) n->track_write(vcpu, gpa, new, bytes, n); srcu_read_unlock(&head->track_srcu, idx); @@ -254,7 +255,8 @@ void kvm_page_track_flush_slot(struct kvm *kvm, struct kvm_memory_slot *slot) return; idx = srcu_read_lock(&head->track_srcu); - hlist_for_each_entry_rcu(n, &head->track_notifier_list, node) + hlist_for_each_entry_rcu(n, &head->track_notifier_list, node, + srcu_read_lock_held(&head->track_srcu)) if (n->track_flush_slot) n->track_flush_slot(kvm, slot, n); srcu_read_unlock(&head->track_srcu, idx); -- 2.17.1
