[PATCH v4 15/18] KVM: guest_memfd: Fold __kvm_gmem_prepare_folio() into its sole caller

[Sean Christopherson <seanjc@google.com>]

Fold __kvm_gmem_prepare_folio() into kvm_gmem_prepare_folio() and extend
the #ifdef guard to cover all of the kvm_gmem_prepare_folio().  Providing
a single-use, ~2 line tail-call helper adds no value.  In fact, due to
having to reconstitue the gfn, the separate helper is very arguably a net
negative.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 virt/kvm/guest_memfd.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index f4f8635d1a10..d5d3688eb1bd 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -60,19 +60,6 @@ static pgoff_t kvm_gmem_get_index(struct kvm_memory_slot *slot, gfn_t gfn)
 	return gfn - slot->base_gfn + slot->gmem.pgoff;
 }
 
-static int __kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slot,
-				    pgoff_t index, struct folio *folio)
-{
-#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_PREPARE
-	kvm_pfn_t pfn = folio_file_pfn(folio, index);
-	gfn_t gfn = slot->base_gfn + index - slot->gmem.pgoff;
-
-	return kvm_arch_gmem_prepare(kvm, gfn_to_gpa(gfn), pfn, folio_order(folio));
-#else
-	return 0;
-#endif
-}
-
 /*
  * Process @folio, which contains @gfn, so that the guest can use it.
  * The folio must be locked and the gfn must be contained in @slot.
@@ -82,6 +69,7 @@ static int __kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slo
 static int kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slot,
 				  gfn_t gfn, struct folio *folio)
 {
+#ifdef CONFIG_HAVE_KVM_ARCH_GMEM_PREPARE
 	pgoff_t index;
 
 	/*
@@ -101,7 +89,12 @@ static int kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slot,
 	index = kvm_gmem_get_index(slot, gfn);
 	index = ALIGN_DOWN(index, folio_nr_pages(folio));
 
-	return __kvm_gmem_prepare_folio(kvm, slot, index, folio);
+	return kvm_arch_gmem_prepare(kvm, gfn_to_gpa(gfn),
+				     folio_file_pfn(folio, index),
+				     folio_order(folio));
+#else
+	return 0;
+#endif
 }
 
 /*
-- 
2.55.0.795.g602f6c329a-goog