Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760878AbYFPIw0 (ORCPT ); Mon, 16 Jun 2008 04:52:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754786AbYFPIwS (ORCPT ); Mon, 16 Jun 2008 04:52:18 -0400 Received: from ti-out-0910.google.com ([209.85.142.189]:22072 "EHLO ti-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754451AbYFPIwR (ORCPT ); Mon, 16 Jun 2008 04:52:17 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=U7ARMOHr0xSBfOTrGKaM0idsGm8z3hF85hYZooLFuECilpdsB7eMWmo97fcze9f46P aq5kFJppCv+GNsOdcl+8r3hoUX5R6tRPKJD1Of89/h8ByKitq0l2zuzY6sjW+AKCa5qn tDAqKCDIjnP0EZvEUfDrlKav9COHAX2t6YG5M= Message-ID: Date: Mon, 16 Jun 2008 16:52:16 +0800 From: "Dave Young" To: "Ingo Molnar" Subject: Re: [PATCH] kernel parameter vmalloc size fix Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, hpa@zytor.com, "the arch/x86 maintainers" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20080616042528.GA3003@darkstar.te-china.tietoenator.com> <20080616080131.GC25632@elte.hu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1438 Lines: 37 On Mon, Jun 16, 2008 at 4:08 PM, Dave Young wrote: > On Mon, Jun 16, 2008 at 4:01 PM, Ingo Molnar wrote: >> >> * Dave Young wrote: >> >>> booting kernel with vmalloc=[any size<=16m] will oops. >>> >>> It's due to the vm area hole. >>> >>> In include/asm-x86/pgtable_32.h: >>> #define VMALLOC_OFFSET (8 * 1024 * 1024) >>> #define VMALLOC_START (((unsigned long)high_memory + 2 * VMALLOC_OFFSET - 1) \ >>> & ~(VMALLOC_OFFSET - 1)) >>> >>> BUG_ON in arch/x86/mm/init_32.c will be triggered: >>> BUG_ON((unsigned long)high_memory > VMALLOC_START); >>> >>> Fixed by return -EINVAL for invalid parameter >> >> hm. Why dont we instead add the size of the hole to the >> __VMALLOC_RESERVE value instead? There's nothing inherently bad about >> using vmalloc=16m. The VM area hole is really a kernel-internal >> abstraction that should not be visible in the usage of the parameter. I built with: __VMALLOC_RESERVE = memparse(arg, &arg) + 2 * VMALLOC_OFFSET; But it doesn't work, still oops at ie. vmalloc=4M (BUT vmalloc=8M is ok) I can't figure out what's wrong with it. Regards dave -- 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/