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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham 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 57A3FC46475 for ; Thu, 25 Oct 2018 19:26:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2A64207DD for ; Thu, 25 Oct 2018 19:26:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b="R4cERhs2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F2A64207DD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lunn.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726078AbeJZEAt (ORCPT ); Fri, 26 Oct 2018 00:00:49 -0400 Received: from vps0.lunn.ch ([185.16.172.187]:43263 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725725AbeJZEAt (ORCPT ); Fri, 26 Oct 2018 00:00:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date; bh=b2L9OcuxWTyVCWjuH3Ty/bmDJ0GDfD86zGsQuGMSifY=; b=R4cERhs2tWh3Ixdchvg0jrfd05N7aTXOLsqG7MUtZOPSlf2Zgd69qEjld5Qbk4uCY6NUS5RwwSYOplpepFhF2u17+McERYnpCFBu068d+VEScDlduZL3tadGf4NnRUIf1Fen90lbaUOh0PtLdYWqyEDmEO7V6dzN+MMM5m1xxbQ=; Received: from andrew by vps0.lunn.ch with local (Exim 4.84_2) (envelope-from ) id 1gFlGv-0004qQ-0U; Thu, 25 Oct 2018 21:26:21 +0200 Date: Thu, 25 Oct 2018 21:26:21 +0200 From: Andrew Lunn To: Florian Fainelli Cc: linux-arm-kernel@lists.infradead.org, ebiederm@xmission.com, Russell King , Andrew Morton , Souptick Joarder , Tony Lindgren , open list Subject: Re: [PATCH v2] ARM: mm: Facilitate debugging CONFIG_KUSER_HELPERS disabled Message-ID: <20181025192621.GB16785@lunn.ch> References: <20181025190110.7564-1-f.fainelli@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181025190110.7564-1-f.fainelli@gmail.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 25, 2018 at 12:01:08PM -0700, Florian Fainelli wrote: > Some software such as perf makes unconditional use of the special > [vectors] page which is only provided when CONFIG_KUSER_HELPERS is > enabled in the kernel. > > Facilitate the debugging of such situations by printing a debug message > to the kernel log showing the task name and the faulting address. Hi Florian Nice. I wish we had this a couple of months ago. Reviewed-by: Andrew Lunn Thanks Andrew