From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1HvxJO-00026E-RJ for user-mode-linux-devel@lists.sourceforge.net; Wed, 06 Jun 2007 08:20:38 -0700 Received: from saraswathi.solana.com ([198.99.130.12]) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1HvxJN-0008Ah-34 for user-mode-linux-devel@lists.sourceforge.net; Wed, 06 Jun 2007 08:20:38 -0700 Date: Wed, 6 Jun 2007 11:11:34 -0400 From: Jeff Dike Message-ID: <20070606151134.GA5972@c2.user-mode-linux.org> References: <20070605205055.GA9770@c2.user-mode-linux.org> <20070605170001.c8b2110e.akpm@linux-foundation.org> <20070606003752.GA11511@c2.user-mode-linux.org> <20070605182024.003502d4.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: <20070605182024.003502d4.akpm@linux-foundation.org> Subject: Re: [uml-devel] [PATCH 2/2] UML - Fix kernel stack size on x86_64 List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: user-mode-linux-devel-bounces@lists.sourceforge.net Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: Andrew Morton Cc: LKML , uml-devel On Tue, Jun 05, 2007 at 06:20:24PM -0700, Andrew Morton wrote: > If you do > > - int "Kernel stack size order" > + int > > then this rule will no longer be offered to the user and `make oldconfig' > (actually anythingconfig) will override whatever happens to be in .config > for KERNEL_STACK_ORDER. You're saying that making an option user-visible changes whether *config overrides .config? That's non-intuitive. > I'm not sure if that's actually what you want, but if the current situation > is that a random CONFIG_KERNEL_STACK_ORDER=0 left over in .config will > break the kernel at runtime then I think something sterner than editing > defconfig is needed? That's a good point, but I think I do want it user-visible. If someone sees someething I suspect to be a stack overflow, I'd like to be able to tell them to bump KERNEL_STACK_ORDER and see if the problem goes away. As for something sterner, it turns out that Kbuild provides some support for this. So, drop the previous patch in favor of this one: Force KERNEL_STACK_ORDER to be at least 1 on UML/x86_64. Signed-off-by: Jeff Dike -- arch/um/Kconfig | 1 + 1 file changed, 1 insertion(+) Index: linux-2.6.21-mm/arch/um/Kconfig =================================================================== --- linux-2.6.21-mm.orig/arch/um/Kconfig 2007-06-06 09:28:13.000000000 -0400 +++ linux-2.6.21-mm/arch/um/Kconfig 2007-06-06 11:08:49.000000000 -0400 @@ -278,6 +278,7 @@ config HIGHMEM config KERNEL_STACK_ORDER int "Kernel stack size order" default 1 if 64BIT + range 1 10 if 64BIT default 0 if !64BIT help This option determines the size of UML kernel stacks. They will ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933976AbXFFPUt (ORCPT ); Wed, 6 Jun 2007 11:20:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761120AbXFFPUm (ORCPT ); Wed, 6 Jun 2007 11:20:42 -0400 Received: from saraswathi.solana.com ([198.99.130.12]:56539 "EHLO saraswathi.solana.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755584AbXFFPUl (ORCPT ); Wed, 6 Jun 2007 11:20:41 -0400 Date: Wed, 6 Jun 2007 11:11:34 -0400 From: Jeff Dike To: Andrew Morton Cc: LKML , uml-devel Subject: Re: [PATCH 2/2] UML - Fix kernel stack size on x86_64 Message-ID: <20070606151134.GA5972@c2.user-mode-linux.org> References: <20070605205055.GA9770@c2.user-mode-linux.org> <20070605170001.c8b2110e.akpm@linux-foundation.org> <20070606003752.GA11511@c2.user-mode-linux.org> <20070605182024.003502d4.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070605182024.003502d4.akpm@linux-foundation.org> User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 05, 2007 at 06:20:24PM -0700, Andrew Morton wrote: > If you do > > - int "Kernel stack size order" > + int > > then this rule will no longer be offered to the user and `make oldconfig' > (actually anythingconfig) will override whatever happens to be in .config > for KERNEL_STACK_ORDER. You're saying that making an option user-visible changes whether *config overrides .config? That's non-intuitive. > I'm not sure if that's actually what you want, but if the current situation > is that a random CONFIG_KERNEL_STACK_ORDER=0 left over in .config will > break the kernel at runtime then I think something sterner than editing > defconfig is needed? That's a good point, but I think I do want it user-visible. If someone sees someething I suspect to be a stack overflow, I'd like to be able to tell them to bump KERNEL_STACK_ORDER and see if the problem goes away. As for something sterner, it turns out that Kbuild provides some support for this. So, drop the previous patch in favor of this one: Force KERNEL_STACK_ORDER to be at least 1 on UML/x86_64. Signed-off-by: Jeff Dike -- arch/um/Kconfig | 1 + 1 file changed, 1 insertion(+) Index: linux-2.6.21-mm/arch/um/Kconfig =================================================================== --- linux-2.6.21-mm.orig/arch/um/Kconfig 2007-06-06 09:28:13.000000000 -0400 +++ linux-2.6.21-mm/arch/um/Kconfig 2007-06-06 11:08:49.000000000 -0400 @@ -278,6 +278,7 @@ config HIGHMEM config KERNEL_STACK_ORDER int "Kernel stack size order" default 1 if 64BIT + range 1 10 if 64BIT default 0 if !64BIT help This option determines the size of UML kernel stacks. They will