From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932584AbaDVOb1 (ORCPT ); Tue, 22 Apr 2014 10:31:27 -0400 Received: from top.free-electrons.com ([176.31.233.9]:49245 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756571AbaDVObF (ORCPT ); Tue, 22 Apr 2014 10:31:05 -0400 Date: Tue, 22 Apr 2014 11:30:37 -0300 From: Ezequiel Garcia To: Ley Foon Tan Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, lftan.linux@gmail.com, cltang@codesourcery.com Subject: Re: [PATCH 08/28] nios2: MMU Fault handling Message-ID: <20140422143036.GD15745@arch.cereza> References: <1397824031-4892-1-git-send-email-lftan@altera.com> <1397824031-4892-6-git-send-email-lftan@altera.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1397824031-4892-6-git-send-email-lftan@altera.com> User-Agent: Mutt/1.5.22 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Ley Foon, On Apr 18, Ley Foon Tan wrote: > + > +bad_area_nosemaphore: > + /* User mode accesses just cause a SIGSEGV */ > + if (user_mode(regs)) { I found that it's useful to add some printing here, just as ARM does. I carry this patch on my kernel: + printk(KERN_INFO "%s: unhandled page fault (%d) at 0x%08lx, cause %ld\n", + current->comm, SIGSEGV, address, cause); + show_regs(regs); Do you think we could do something like it? Maybe with a compile time option? > + _exception(SIGSEGV, regs, code, address); > + return; > + } > + -- Ezequiel García, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com