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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS 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 3A804C433E6 for ; Wed, 17 Mar 2021 22:24:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E16A264F2A for ; Wed, 17 Mar 2021 22:24:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229944AbhCQWXj (ORCPT ); Wed, 17 Mar 2021 18:23:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:55452 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229809AbhCQWXO (ORCPT ); Wed, 17 Mar 2021 18:23:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EFD7264DE7; Wed, 17 Mar 2021 22:23:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1616019794; bh=73XvZj92wTv5ZQxPf5DIjS3QKL6XBRR6zTcruA3a6WY=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=VACpmxCCk2UQqM1AlhvoMUq+diWMo8zS+IpRfgc0dSTGJ0bjvu3okx6ZMalKy0Y+N 6lOH96jZPQ9w5fYnD1mUxQuvAUnvspM2xWwGo5AcmfCYF0NWwxIkyAQhHhm3wyap5d Lc0YCVJgd+dg1s+K5Nnd61ijZoGBrfXgcUUVaZSo= Date: Wed, 17 Mar 2021 15:23:12 -0700 From: Andrew Morton To: Chen Jun Cc: , , , , Subject: Re: [PATCH 0/2] Fix page_owner broken on arm64 Message-Id: <20210317152312.32e6fc7dd469cd7df57ed2e5@linux-foundation.org> In-Reply-To: <20210317142050.57712-1-chenjun102@huawei.com> References: <20210317142050.57712-1-chenjun102@huawei.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 17 Mar 2021 14:20:48 +0000 Chen Jun wrote: > On arm64, cat /sys/kernel/debug/page_owner > All pages return the same stack > stack_trace_save+0x4c/0x78 > register_early_stack+0x34/0x70 > init_page_owner+0x34/0x230 > page_ext_init+0x1bc/0x1dc > > The reason is arch_stack_walk save 2 more entries than before. > > To fix it, add skip in arch_stack_walk > > *** BLURB HERE *** > > 1. Prepare for 2, move stacktrace_cookie to .h > 2. Fix the problem > 5fc57df2f6fd was September 2020, so I assume we'll be needing cc:stable on these? (I'll also assume that the arm folks will be handling these)