From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from casper.infradead.org ([85.118.1.10]:52102 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751343AbaDVHjD (ORCPT ); Tue, 22 Apr 2014 03:39:03 -0400 Message-ID: <1398152333.723.27.camel@shinybook.infradead.org> Subject: Re: [Patch Part3 V1 19/22] iommu/vt-d: simplify intel_unmap_sg() and kill duplicated code From: David Woodhouse To: Jiang Liu Cc: Joerg Roedel , Yinghai Lu , Bjorn Helgaas , Dan Williams , Vinod Koul , "Rafael J . Wysocki" , Ashok Raj , Yijing Wang , Tony Luck , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Date: Tue, 22 Apr 2014 08:38:53 +0100 In-Reply-To: <1398150453-28141-20-git-send-email-jiang.liu@linux.intel.com> References: <1398150453-28141-1-git-send-email-jiang.liu@linux.intel.com> <1398150453-28141-20-git-send-email-jiang.liu@linux.intel.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-iq8cj1xSvAzp9OEz/P0v" Mime-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org List-ID: --=-iq8cj1xSvAzp9OEz/P0v Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2014-04-22 at 15:07 +0800, Jiang Liu wrote: > + size_t size =3D 0; > +#if 0 > + /* current the third argument of intel_unmap_page is unsued */ > + int i; > + struct scatterlist *sg; > =20 > - freelist =3D domain_unmap(domain, start_pfn, last_pfn); > + for_each_sg(sglist, sg, nelems, i) > + size +=3D sg->length; > +#endif Please don't do that. If you want to rely on the fact that intel_unmap_page() currently just uses the size from the IOVA it finds, then split it out into a separate function which explicitly does precisely that. And call that new function from both intel_unmap_sg() and intel_unmap_page(). --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-iq8cj1xSvAzp9OEz/P0v Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISxDCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 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