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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, 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 0F347C04FF3 for ; Mon, 24 May 2021 11:36:51 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A8CF361028 for ; Mon, 24 May 2021 11:36:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A8CF361028 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 166EF94006D; Mon, 24 May 2021 07:36:50 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 12B8C940055; Mon, 24 May 2021 07:36:50 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0065494006D; Mon, 24 May 2021 07:36:49 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0220.hostedemail.com [216.40.44.220]) by kanga.kvack.org (Postfix) with ESMTP id C7014940055 for ; Mon, 24 May 2021 07:36:49 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 5711F180ACEEB for ; Mon, 24 May 2021 11:36:49 +0000 (UTC) X-FDA: 78175922538.15.BABDEE7 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf19.hostedemail.com (Postfix) with ESMTP id DE9AA90009E2 for ; Mon, 24 May 2021 11:36:42 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1621856208; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=I84Om9AbLWUNDYu7X6goqSlgpXNz4H2MwZ+N97qbSrs=; b=a77rihw26UhxQGU9Effv3MJDf+qpFhEIwSCjsfb7zneb/g2UjLKUNyjlhBfENDdAK4I93U 2MRSuUUqcPYbZtj3Ayx9Q0RbqvknTxUxzOqz89UWazKaLv4nMbQUrtjcIc6zPWbl9x5fAs CMEuRFt1xK3TZLmWlbNsQm4Qky7RZak= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id EB5DDAD05; Mon, 24 May 2021 11:36:47 +0000 (UTC) Date: Mon, 24 May 2021 13:36:47 +0200 From: Petr Mladek To: Stephen Boyd Cc: Andrew Morton , linux-kernel@vger.kernel.org, Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Vlastimil Babka , linux-mm@kvack.org Subject: Re: [PATCH 1/3] lib/hexdump: Add a raw pointer printing format for slub debugging Message-ID: <20210524113647.h2avhbrngyydwwqn@pathway.suse.cz> References:<20210520013539.3733631-1-swboyd@chromium.org> <20210520013539.3733631-2-swboyd@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To:<20210520013539.3733631-2-swboyd@chromium.org> User-Agent: NeoMutt/20170912 (1.9.0) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=suse.com header.s=susede1 header.b=a77rihw2; dmarc=pass (policy=quarantine) header.from=suse.com; spf=pass (imf19.hostedemail.com: domain of pmladek@suse.com designates 195.135.220.15 as permitted sender) smtp.mailfrom=pmladek@suse.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: DE9AA90009E2 X-Stat-Signature: kpm3b843f1innmguxtzjmjqmg5oisosa X-HE-Tag: 1621856202-190936 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed 2021-05-19 18:35:37, Stephen Boyd wrote: > We want to get actual pointer addresses when we're looking at slub > debugging reports. Add another prefix format specifier that says we want > raw pointer addresses, i.e. %px, in the printk format. This patch makes sense only with the 2nd patch. Please, do not do this! Raw pointers might be printed safely only in panic(). Users should be warned by the fat warning triggered by "no_hash_pointers" in other use-cases. And this patch is not needed when "no_hash_pointers" are enabled. Best Regards, Petr