Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757153AbaDHP0N (ORCPT ); Tue, 8 Apr 2014 11:26:13 -0400 Received: from mail-ve0-f174.google.com ([209.85.128.174]:52656 "EHLO mail-ve0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756382AbaDHP0K (ORCPT ); Tue, 8 Apr 2014 11:26:10 -0400 MIME-Version: 1.0 In-Reply-To: <20140407201919.GA15838@sepie.suse.cz> References: <20140407201919.GA15838@sepie.suse.cz> Date: Tue, 8 Apr 2014 08:26:09 -0700 X-Google-Sender-Auth: Kh0ocpV2FOB0j9nJ7BTaKisTJzc Message-ID: Subject: Re: [GIT] kbuild/lto changes for 3.15-rc1 From: Linus Torvalds To: Michal Marek Cc: Andi Kleen , Linux Kbuild mailing list , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 7, 2014 at 1:19 PM, Michal Marek wrote: > > besides the kbuild branch, here is the LTO build support by Andi. It is > a separate branch, because it depends on other patches by Andi which > were merged through other trees. The link-time-optimization build is an > experimental feature, so there one kconfig option to enable it and > another kconfig option to disable it (behind a door with a sign "Beware > of the Leopard"...), so that it is not enabled by > allmodconfig/allyesconfig. So right now, I see several reasons not to merge it ("It's so experimental that we don't even want to encourage people to test it" to "it's not fully fleshed out yet and makes compile times _much_ longer"). And yet nobody has actually talked about why I *should* merge it. Which - I think understandably - makes me less than enthusiastic. So I think I'll let this wait a bit longer, _unless_ people start talking about the upsides. How much smaller is the end result? How much faster is it? How much more beautiful is it? Does it make new cool things possible? Are those cool things really close on the horizon and really want this merged even though it's not really quite ready yet? So please: convince me. Andi? Linus -- 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/