Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751568Ab3JYHBJ (ORCPT ); Fri, 25 Oct 2013 03:01:09 -0400 Received: from mail-vb0-f44.google.com ([209.85.212.44]:35879 "EHLO mail-vb0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751388Ab3JYHBH (ORCPT ); Fri, 25 Oct 2013 03:01:07 -0400 MIME-Version: 1.0 In-Reply-To: <87y55h7vcd.fsf@rustcorp.com.au> References: <1382498320-26594-1-git-send-email-tom.leiming@gmail.com> <87eh7bfoq9.fsf@rustcorp.com.au> <20131024084559.GD16735@n2100.arm.linux.org.uk> <87mwlyclng.fsf@rustcorp.com.au> <87y55h7vcd.fsf@rustcorp.com.au> Date: Fri, 25 Oct 2013 15:01:05 +0800 Message-ID: Subject: Re: [RFC PATCH] kernel/kallsyms.c: only show legal kernel symbol From: Ming Lei To: Rusty Russell Cc: Russell King - ARM Linux , Andrew Morton , Linux Kernel Mailing List , Chen Gang , linux-arm-kernel Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1212 Lines: 30 On Fri, Oct 25, 2013 at 1:50 PM, Rusty Russell wrote: > Ming Lei writes: >> On Fri, Oct 25, 2013 at 7:08 AM, Rusty Russell wrote: >>> >>> Sorry, I was imprecise. I was referring to the kernel's kallsyms >>> tables produced by scripts/kallsyms.c. This patch left them in the >>> the kallsyms tables and filtered them out from /proc/kallsyms. >> >> Yes, but it isn't easy to do it by script/kallsyms.c , and IMO, it should >> be correct to hide them for user space but keep them in kallsyms table. > > So they'll appear in backtraces? And turn up randomly for other symbol > dereferences? > > I don't think you really want this! Basically these symbols are only used to generate code, and in kernel mode, CPU won't run into the corresponding addresses because the generate code is copied to other address during booting, so I understand they won't appear in backtraces. Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/