kvm: Remove the unused macro KVM_MMU_READ_{,UN}LOCK()

No code is using KVM_MMU_READ_LOCK() or KVM_MMU_READ_UNLOCK().  They
used to be in virt/kvm/pfncache.c:

                KVM_MMU_READ_LOCK(kvm);
                retry = mmu_notifier_retry_hva(kvm, mmu_seq, uhva);
                KVM_MMU_READ_UNLOCK(kvm);

However, since 58cd407ca4c6 ("KVM: Fix multiple races in gfn=>pfn cache
refresh", 2022-05-25) the code is only relying on the MMU notifier's
invalidation count and sequence number.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Message-Id: <20221207120617.9409-1-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h
index a1ab150..180f1a0 100644 (file)
--- a/virt/kvm/kvm_mm.h
+++ b/virt/kvm/kvm_mm.h
@@ -14,14 +14,10 @@
 #define KVM_MMU_LOCK_INIT(kvm)         rwlock_init(&(kvm)->mmu_lock)
 #define KVM_MMU_LOCK(kvm)              write_lock(&(kvm)->mmu_lock)
 #define KVM_MMU_UNLOCK(kvm)            write_unlock(&(kvm)->mmu_lock)
-#define KVM_MMU_READ_LOCK(kvm)         read_lock(&(kvm)->mmu_lock)
-#define KVM_MMU_READ_UNLOCK(kvm)       read_unlock(&(kvm)->mmu_lock)
 #else
 #define KVM_MMU_LOCK_INIT(kvm)         spin_lock_init(&(kvm)->mmu_lock)
 #define KVM_MMU_LOCK(kvm)              spin_lock(&(kvm)->mmu_lock)
 #define KVM_MMU_UNLOCK(kvm)            spin_unlock(&(kvm)->mmu_lock)
-#define KVM_MMU_READ_LOCK(kvm)         spin_lock(&(kvm)->mmu_lock)
-#define KVM_MMU_READ_UNLOCK(kvm)       spin_unlock(&(kvm)->mmu_lock)
 #endif /* KVM_HAVE_MMU_RWLOCK */
 
 kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool interruptible,