From: Isaku Yamahata <isaku.yamahata@intel.com>

TDP MMU allows tdp_mmu_set_spte_atomic() and tdp_mmu_zap_spte_atomic() to
return -EBUSY or -EAGAIN error.  The caller must check the return value and
retry.  Sprinkle __must_check to guarantee it.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index d76c1ad44638..882848b24941 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -567,9 +567,9 @@ static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
  *            no side-effects other than setting iter->old_spte to the last
  *            known value of the spte.
  */
-static inline int tdp_mmu_set_spte_atomic(struct kvm *kvm,
-					  struct tdp_iter *iter,
-					  u64 new_spte)
+static inline int __must_check tdp_mmu_set_spte_atomic(struct kvm *kvm,
+						       struct tdp_iter *iter,
+						       u64 new_spte)
 {
 	u64 *sptep = rcu_dereference(iter->sptep);
 
@@ -599,8 +599,8 @@ static inline int tdp_mmu_set_spte_atomic(struct kvm *kvm,
 	return 0;
 }
 
-static inline int tdp_mmu_zap_spte_atomic(struct kvm *kvm,
-					  struct tdp_iter *iter)
+static inline int __must_check tdp_mmu_zap_spte_atomic(struct kvm *kvm,
+						       struct tdp_iter *iter)
 {
 	int ret;
 
-- 
2.25.1