KVM: MMU: fix compile warning in kvm_send_hwpoison_signal()

fix:

arch/x86/kvm/mmu.c: In function ‘kvm_send_hwpoison_signal’:
arch/x86/kvm/mmu.c:2051: warning: ignoring return value of ‘copy_from_user’, declared with attribute warn_unused_resul

Reported-by: Jan Kiszka <jan.kiszka@web.de>
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 0e351060bc890eb21a9e47043d7ba22f8bdaf085..7c3e09d5d85ab7703d38a9a725ba3c0306bc6ae2 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2049,7 +2049,7 @@ static void kvm_send_hwpoison_signal(struct kvm *kvm, gfn_t gfn)
 
        /* Touch the page, so send SIGBUS */
        hva = (void __user *)gfn_to_hva(kvm, gfn);
-       (void)copy_from_user(buf, hva, 1);
+       r = copy_from_user(buf, hva, 1);
 }
 
 static int kvm_handle_bad_page(struct kvm *kvm, gfn_t gfn, pfn_t pfn)