[PATCH] KVM: Fix a warning in __kvm_gfn_to_hva_cache_init()

[Peter Xu]

GCC 10.0.1 gives me this warning when building KVM:

  warning: ânr_pages_availâ may be used uninitialized in this function [-Wmaybe-uninitialized]
  2442 |  for ( ; start_gfn <= end_gfn; start_gfn += nr_pages_avail) {

It should not happen, but silent it.

Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
 virt/kvm/kvm_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 74bdb7bf3295..2da293885a67 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2425,7 +2425,7 @@ static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots,
 	gfn_t start_gfn = gpa >> PAGE_SHIFT;
 	gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
 	gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
-	gfn_t nr_pages_avail;
+	gfn_t nr_pages_avail = 0;
 
 	/* Update ghc->generation before performing any error checks. */
 	ghc->generation = slots->generation;
-- 
2.26.2