Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758184Ab3GOWDq (ORCPT ); Mon, 15 Jul 2013 18:03:46 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:50131 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755095Ab3GOWDp (ORCPT ); Mon, 15 Jul 2013 18:03:45 -0400 Date: Mon, 15 Jul 2013 15:03:42 -0700 From: Andrew Morton To: Ingo Molnar Cc: Kyungsik Lee , Michal Marek , linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, x86@kernel.org, celinux-dev@lists.celinuxforum.org, linux-arm-kernel@lists.infradead.org, hyojun.im@lge.com, chan.jeong@lge.com, raphael.andy.lee@gmail.com, "H. Peter Anvin" , Ingo Molnar , Thomas Gleixner , Russell King , Borislav Petkov , Florian Fainelli , Yann Collet , Chanho Min Subject: Re: [PATCH -next 2/2] kbuild: fix for updated LZ4 tool with the new streaming format Message-Id: <20130715150342.35f7620ffe0835e3e2bc37d0@linux-foundation.org> In-Reply-To: <20130712075602.GA4002@gmail.com> References: <1367829775-4434-1-git-send-email-kyungsik.lee@lge.com> <1367829775-4434-2-git-send-email-kyungsik.lee@lge.com> <20130712075602.GA4002@gmail.com> X-Mailer: Sylpheed 3.2.0beta5 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1490 Lines: 42 On Fri, 12 Jul 2013 09:56:02 +0200 Ingo Molnar wrote: > > * Kyungsik Lee wrote: > > quiet_cmd_lz4 = LZ4 $@ > > cmd_lz4 = (cat $(filter-out FORCE,$^) | \ > > - lz4demo -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ > > + lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ > > (rm -f $@ ; false) > > None of the major distros I tried has the lz4 or lz4c binary available, > and this breaks randconfig builds: > > /bin/sh: lz4c: command not found > > If: > > CONFIG_HAVE_KERNEL_LZ4=y > CONFIG_KERNEL_LZ4=y > CONFIG_RD_LZ4=y > CONFIG_LZ4_DECOMPRESS=y > CONFIG_DECOMPRESS_LZ4=y > > If a utility is not widely available yet and if the utility is not in the > kernel proper, could you please at least make sure that randconfig does > not stumble over non-buildable kernels? I don't know how to do this. Any suggestions? It has to be done at `make config' time. We'd need to probe for the presence of lz4c and then.... what? Is there any precedent for this? I don't think we can just ignore the absence of lz4c - the user has selected a config which his system cannot build. The problem lies within randconfig itself. -- 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/