From patchwork Sat Dec 7 09:25:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 11277301 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7C04D112B for ; Sat, 7 Dec 2019 09:26:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 63F0C24670 for ; Sat, 7 Dec 2019 09:26:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726605AbfLGJ0F (ORCPT ); Sat, 7 Dec 2019 04:26:05 -0500 Received: from szxga07-in.huawei.com ([45.249.212.35]:44662 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726289AbfLGJZp (ORCPT ); Sat, 7 Dec 2019 04:25:45 -0500 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id EDD442BAA77B5C873DA8; Sat, 7 Dec 2019 17:25:41 +0800 (CST) Received: from huawei.com (10.175.105.18) by DGGEMS409-HUB.china.huawei.com (10.3.19.209) with Microsoft SMTP Server id 14.3.439.0; Sat, 7 Dec 2019 17:25:35 +0800 From: linmiaohe To: , , , , , , , , , , CC: , , , Subject: [PATCH 4/6] KVM: x86: remove always equal to 0 return val of kvm_vm_ioctl_set_pit2() Date: Sat, 7 Dec 2019 17:25:21 +0800 Message-ID: <1575710723-32094-5-git-send-email-linmiaohe@huawei.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1575710723-32094-1-git-send-email-linmiaohe@huawei.com> References: <1575710723-32094-1-git-send-email-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.105.18] X-CFilter-Loop: Reflected Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Miaohe Lin The return val of kvm_vm_ioctl_set_pit2() is always equal to 0, which means there is no way to failed with this function. So remove the return val as it's unnecessary to check against it. Also add BUILD_BUG_ON to guard against channels size changed unexpectly. Signed-off-by: Miaohe Lin --- arch/x86/kvm/x86.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 637d5c6b92be..2d4e3a2dfec6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4634,13 +4634,15 @@ static void kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) memset(&ps->reserved, 0, sizeof(ps->reserved)); } -static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) +static void kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) { int start = 0; int i; u32 prev_legacy, cur_legacy; struct kvm_pit *pit = kvm->arch.vpit; + BUILD_BUG_ON(sizeof(ps->channels) != sizeof(pit->pit_state.channels)); + mutex_lock(&pit->pit_state.lock); prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY; cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY; @@ -4653,7 +4655,6 @@ static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps) kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count, start && i == 0); mutex_unlock(&pit->pit_state.lock); - return 0; } static int kvm_vm_ioctl_reinject(struct kvm *kvm, @@ -5019,7 +5020,8 @@ long kvm_arch_vm_ioctl(struct file *filp, r = -ENXIO; if (!kvm->arch.vpit) goto out; - r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2); + kvm_vm_ioctl_set_pit2(kvm, &u.ps2); + r = 0; break; } case KVM_REINJECT_CONTROL: {