Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755939AbZCVUaH (ORCPT ); Sun, 22 Mar 2009 16:30:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755241AbZCVU3y (ORCPT ); Sun, 22 Mar 2009 16:29:54 -0400 Received: from swampdragon.chaosbits.net ([90.184.90.115]:16315 "EHLO swampdragon.chaosbits.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754984AbZCVU3x (ORCPT ); Sun, 22 Mar 2009 16:29:53 -0400 Date: Sun, 22 Mar 2009 21:29:51 +0100 (CET) From: Jesper Juhl To: Dragoslav Zaric cc: LKML Subject: Re: Test some kernel feature without recompile In-Reply-To: <2d05c4580903220343l4b1359fx79f18b56203bd463@mail.gmail.com> Message-ID: References: <2d05c4580903220343l4b1359fx79f18b56203bd463@mail.gmail.com> User-Agent: Alpine 2.00 (LNX 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1526 Lines: 36 On Sun, 22 Mar 2009, Dragoslav Zaric wrote: > Hi, > > I know when you work on some kernel module, you can change code and load > module again and test it, but what if you change some built in kernel > .c file, why > would I need to recompile whole kernel just to see what happens if I change one > .c file ?? > Depends on the nature of the change. Some changes will ripple through the whole kernel. If, for example, you made a change to kmalloc() so that it takes an extra argument, then obviously all call sites would need changing and since kmalloc is used almose everywhere, then almost all files would need to be recompiled. But if your change is entirely contained to a single file, then 'make' will already ensure that only that file is rebuilt when you run 'make' (you'll still have to re-link the kernel or module though and a reboot will still be needed). > Why can I just compile one changed .c file and copy it where compiled version of > that file reside inside kernel tree? 'make' should already handle that for you. In what way does it not? -- Jesper Juhl http://www.chaosbits.net/ Plain text mails only, please http://www.expita.com/nomime.html Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html -- 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/