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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA09EC433DB for ; Tue, 16 Feb 2021 17:05:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9547664DCF for ; Tue, 16 Feb 2021 17:05:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230475AbhBPRFR (ORCPT ); Tue, 16 Feb 2021 12:05:17 -0500 Received: from mga02.intel.com ([134.134.136.20]:38670 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230454AbhBPRFQ (ORCPT ); Tue, 16 Feb 2021 12:05:16 -0500 IronPort-SDR: aNV41zNvWjWyv3oOIrXW9d1I+jh/NJ7fLpDNWgqjx7iI6UNU+ty0amTZ/8opr6ArBiz2YvZ59s DCZ+fnAJ69jg== X-IronPort-AV: E=McAfee;i="6000,8403,9897"; a="170081670" X-IronPort-AV: E=Sophos;i="5.81,184,1610438400"; d="scan'208";a="170081670" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2021 09:04:29 -0800 IronPort-SDR: BFjrZ2wZbybembjxfRLB+E7QumBZHjfL0PpXV7rBkjvdCpr2lLYWxt1dGOi/j0VLSVxu27yEN3 bbDvjVHDvz1A== X-IronPort-AV: E=Sophos;i="5.81,184,1610438400"; d="scan'208";a="589291958" Received: from twblanch-mobl.amr.corp.intel.com (HELO [10.209.156.22]) ([10.209.156.22]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2021 09:04:26 -0800 Subject: Re: [RFC PATCH v5 03/26] x86/sgx: Wipe out EREMOVE from sgx_free_epc_page() To: Kai Huang , linux-sgx@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org Cc: seanjc@google.com, jarkko@kernel.org, luto@kernel.org, rick.p.edgecombe@intel.com, haitao.huang@intel.com, pbonzini@redhat.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com References: From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org > +/* > + * Place the page in uninitialized state. Only usable by callers that > + * know the page is in a clean state in which EREMOVE will succeed. > + */ > +static void sgx_reset_epc_page(struct sgx_epc_page *epc_page) > +{ > + int ret; > + > + WARN_ON_ONCE(epc_page->flags & SGX_EPC_PAGE_RECLAIMER_TRACKED); > + > + ret = __eremove(sgx_get_epc_virt_addr(epc_page)); > + if (WARN_ONCE(ret, "EREMOVE returned %d (0x%x)", ret, ret)) > + return; > +} Shouldn't this just be: ... ret = __eremove(sgx_get_epc_virt_addr(epc_page)); WARN_ONCE(ret, "EREMOVE returned %d (0x%x)", ret, ret); } Sometimes, you actually need to look at the code that you cut and paste. ;)