From mboxrd@z Thu Jan 1 00:00:00 1970 From: Denys Vlasenko Subject: Re: Testing of function/data-sections on linux-2.6.35-rc4 Date: Mon, 26 Jul 2010 03:31:34 +0200 Message-ID: <201007260331.34372.vda.linux@googlemail.com> References: <201007181703.17022.vda.linux@googlemail.com> <20100723203543.GB27288@merkur.ravnborg.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-fx0-f46.google.com ([209.85.161.46]:50152 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753134Ab0GZBbk (ORCPT ); Sun, 25 Jul 2010 21:31:40 -0400 In-Reply-To: <20100723203543.GB27288@merkur.ravnborg.org> Content-Disposition: inline Sender: linux-arch-owner@vger.kernel.org List-ID: To: Sam Ravnborg Cc: Tim Abbott , Tim Bird , James Bottomley , linux-kernel@vger.kernel.org, Matt Fleming , linux-arch@vger.kernel.org, Arnd Bergmann , Michal Marek , Parisc List Hi Sam, On Friday 23 July 2010 22:35, Sam Ravnborg wrote: > > > > Then, in order to also garbage-collect the sections, I added > > > > LDFLAGS_vmlinux += --gc-sections > > > > in top-level Makefile. > > > > This requires the additional patch (linux-2.6.35-rc4-fsgs.patch) > > which adds KEEP(section) directives to kernel linker stripts. > > Otherwise, linker will discard some crucial sections. > > > > Changelog does not address why you need: > > -Map $@.ldmap > > and what effect they have. I didn't plan to push the last step (--gc-sections) to mainline yet. Thus the patch has debugging stuff in it. > And it is obvious that some archs should consolidate a little more from > asm-generic/vmlinux.lds.h. > But that said this patch looks much better than the initial versions posted. > > How do you determine which sections needs the KEEP()? > Worth documenting for future when we add new sections. No problem, I will be adding comments at every KEEP() why it's needed. -- vda