From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10EB2C433EF for ; Tue, 14 Jun 2022 12:02:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355700AbiFNMCP (ORCPT ); Tue, 14 Jun 2022 08:02:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355494AbiFNMCJ (ORCPT ); Tue, 14 Jun 2022 08:02:09 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 62AA24925B for ; Tue, 14 Jun 2022 05:02:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1655208124; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=o96R2liK/Rw+rA+r9jCufpYDG8GL1tJQ/8vEiFbyM6o=; b=bXxIGKtZY82zhaB3kQofzlqK84QH+zgmJGzegioWN2d70wtiRMbJcWjaPJdHLzg6wkp2WV gGAGwvnJjLgfw5ePolldQLdooTcLinubm+Um42eXurKUxG4T6Q6bnGpBPBidlWnfH06fPC 5zXFfopmXJrjNQRgUnulXCQy8pqGEf0= Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-671-prXURZg6PCmU1av7Bezv4Q-1; Tue, 14 Jun 2022 08:01:57 -0400 X-MC-Unique: prXURZg6PCmU1av7Bezv4Q-1 Received: by mail-ed1-f72.google.com with SMTP id co13-20020a0564020c0d00b0042dc9ef4f01so6006504edb.16 for ; Tue, 14 Jun 2022 05:01:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:cc:subject:in-reply-to:references :date:message-id:mime-version; bh=o96R2liK/Rw+rA+r9jCufpYDG8GL1tJQ/8vEiFbyM6o=; b=KXQB7/9AiDlhUuHlcBcxazuhmovTbcJTYOuZE0YwLOwO7WDpf45xOX4CY/alpAyzrQ bGYmdEwoQgqys5+nLYJDKXT5gq7yy+e6DANqb9MCAiBaVNTbaVQSqrTKAD5+RxeDaDhN aDWagAcvp8lMDsXas67Tib2Hkx1clpPyOgUlnfspFLowWYZEjomCNHHFUzd2LdR2TISn lapsRrlD4UJrddIG9dadUIfOehA69ZwL1Il+hgRXfxTcXqyF0+DEZVy5mS6qFb7tILiH fWa8P3BVP0IyorUYtqevXWRAhQj2W27pLuL/qqMKc42t3v9laxlJFULYfpXDMJJaCB9n vPbw== X-Gm-Message-State: AOAM533BKLx6BR1h9BHnWioJPzVIxxYPXXZSxed3ZEIV+YlwfSvZJBLV Bbj1ncVDQsPgHDpQUnUwq2RDsw8a1Idfic2pNnTDl61gwOu0JN2Xbc1+BJWPTBZFoYeSRACwIDG LfX+6KST2KDpH0JEcBFoVyCkgN499MKaIOMQ3EwlT7Ul/yUv5RtO5JtRZvMTDdPbb2/8ocXJOpT yb X-Received: by 2002:a05:6402:b09:b0:42d:bd80:11ac with SMTP id bm9-20020a0564020b0900b0042dbd8011acmr5697617edb.244.1655208116077; Tue, 14 Jun 2022 05:01:56 -0700 (PDT) X-Google-Smtp-Source: AGRyM1tEtZpjxqfX31iR1J4Bw5cOqOaEdjuVhAslKHGEPsqyrNUbKoaC6+E3Rv9RKO/BWr1fuea/Iw== X-Received: by 2002:a05:6402:b09:b0:42d:bd80:11ac with SMTP id bm9-20020a0564020b0900b0042dbd8011acmr5697568edb.244.1655208115822; Tue, 14 Jun 2022 05:01:55 -0700 (PDT) Received: from fedora (nat-2.ign.cz. [91.219.240.2]) by smtp.gmail.com with ESMTPSA id v14-20020a056402348e00b0042dc25fdf5bsm7112494edc.29.2022.06.14.05.01.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jun 2022 05:01:55 -0700 (PDT) From: Vitaly Kuznetsov To: Dongliang Mu Cc: Paolo Bonzini , Sean Christopherson , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" Cc: mudongliang , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86: kvm: remove NULL check before kfree In-Reply-To: <20220614085035.122521-1-dzm91@hust.edu.cn> References: <20220614085035.122521-1-dzm91@hust.edu.cn> Date: Tue, 14 Jun 2022 14:01:54 +0200 Message-ID: <87zgifihcd.fsf@redhat.com> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dongliang Mu writes: > From: mudongliang > > kfree can handle NULL pointer as its argument. > According to coccinelle isnullfree check, remove NULL check > before kfree operation. > > Signed-off-by: mudongliang > --- > arch/x86/kernel/kvm.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 1a3658f7e6d9..d4e48b4a438b 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/kvm.c > @@ -236,8 +236,7 @@ void kvm_async_pf_task_wake(u32 token) > raw_spin_unlock(&b->lock); > > /* A dummy token might be allocated and ultimately not used. */ > - if (dummy) > - kfree(dummy); > + kfree(dummy); > } > EXPORT_SYMBOL_GPL(kvm_async_pf_task_wake); Reviewed-by: Vitaly Kuznetsov -- Vitaly