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=-5.5 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 2CC4CC433E0 for ; Wed, 12 Aug 2020 13:53:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0C681206B2 for ; Wed, 12 Aug 2020 13:53:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728134AbgHLNxm (ORCPT ); Wed, 12 Aug 2020 09:53:42 -0400 Received: from mga05.intel.com ([192.55.52.43]:22690 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726946AbgHLNxl (ORCPT ); Wed, 12 Aug 2020 09:53:41 -0400 IronPort-SDR: 6SkX1R2m2falSbh9qKSr2l/3jj6/mVRU/PccIxZFw1z6eIflquUb3uoZf3FJXMLVb3j/SIePjD Y9htXDrz1tSg== X-IronPort-AV: E=McAfee;i="6000,8403,9711"; a="238800222" X-IronPort-AV: E=Sophos;i="5.76,304,1592895600"; d="scan'208";a="238800222" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2020 06:53:40 -0700 IronPort-SDR: y1EYjWL3DTXKTLfmEutBi/BbxfrIhP0u7oY97M+y6nXDk8isFLMI9M6YXENoD0CQCo3d1bBWog 7Yhqz91cC5Bg== X-IronPort-AV: E=Sophos;i="5.76,304,1592895600"; d="scan'208";a="291039440" Received: from hungngux-mobl.amr.corp.intel.com (HELO [10.254.80.79]) ([10.254.80.79]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Aug 2020 06:53:40 -0700 Subject: Re: [PATCH V6 01/16] perf/core: Add PERF_SAMPLE_DATA_PAGE_SIZE To: "Liang, Kan" , Peter Zijlstra Cc: acme@kernel.org, mingo@redhat.com, linux-kernel@vger.kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@redhat.com, eranian@google.com, ak@linux.intel.com, kirill.shutemov@linux.intel.com References: <20200810212436.8026-1-kan.liang@linux.intel.com> <20200810212436.8026-2-kan.liang@linux.intel.com> <298cfc4d-4a9b-7886-1006-09f2bc24d789@linux.intel.com> <20200810224734.GO3982@worktop.programming.kicks-ass.net> <7a37a83a-fd30-3387-98b2-e3d23d36f69c@linux.intel.com> 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: <7a37a83a-fd30-3387-98b2-e3d23d36f69c@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/12/20 6:39 AM, Liang, Kan wrote: > I searched the vma_mmu_pagesize(). It seems that PowerPC is the only > one that defines a 'strong' function. In other words, the MMUPageSize > and KerelPageSize are the same for X86. However, it seems not true > for the above compound page cases. Is it a bug for smaps? Or am I > missed anything? __weak unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) { return vma_kernel_pagesize(vma); } unsigned long vma_kernel_pagesize(struct vm_area_struct *vma) { if (vma->vm_ops && vma->vm_ops->pagesize) return vma->vm_ops->pagesize(vma); return PAGE_SIZE; } It can be overridden with vm_ops too, not just a weak symbol.