[PATCH v17 045/116] KVM: x86/tdp_mmu: Sprinkle __must_check

From: isaku . yamahata
Date: Tue Nov 07 2023 - 10:01:03 EST


From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

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@xxxxxxxxx>
---
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 798149d67419..e25e1343f445 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -518,9 +518,9 @@ 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);

@@ -550,8 +550,8 @@ 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