From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nat28.tlf.novell.com ([130.57.49.28]:37268 "EHLO nat28.tlf.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753260Ab2HSIxG convert rfc822-to-8bit (ORCPT ); Sun, 19 Aug 2012 04:53:06 -0400 Message-Id: <5030B77E020000780008A233@nat28.tlf.novell.com> Date: Sun, 19 Aug 2012 09:53:02 +0100 From: "Jan Beulich" Subject: Re: [PATCH 59/74] lto: Handle LTO common symbols in module loader References: <1345345030-22211-1-git-send-email-andi@firstfloor.org> <1345345030-22211-60-git-send-email-andi@firstfloor.org> In-Reply-To: <1345345030-22211-60-git-send-email-andi@firstfloor.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: andi@firstfloor.org, ak@linux.intel.com, linux-kernel@vger.kernel.org Cc: x86@kernel.org, akpm@linux-foundation.org, jmario@redhat.com, rusty@rustcorp.com.au, mmarek@suse.cz, linux-kbuild@vger.kernel.org >>> Andi Kleen 08/19/12 4:59 AM >>> >@@ -1904,6 +1904,10 @@ static int simplify_symbols(struct module *mod, const struct load_info *info) > > switch (sym[i].st_shndx) { > case SHN_COMMON: >+ /* Ignore common symbols */ >+ if (!strncmp(name, "__gnu_lto", 9)) >+ break; >+ > /* We compiled with -fno-common. These are not > supposed to happen. */ > pr_debug("Common symbol: %s\n", name); I think it is dangerous to just match the start of the symbol name here - this may in the future well lead to ignoring symbols we shouldn't be ignoring. Also I would think the added comment ought to say "Ignore LTO symbols." Otherwise its sort of contradicting the purpose of the case being handled here. Jan