From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d06nrmr1407.portsmouth.uk.ibm.com (d06nrmr1407.portsmouth.uk.ibm.com [9.149.38.185]) by mtagate3.uk.ibm.com (8.13.8/8.13.8) with ESMTP id kAN8p3uO026860 for ; Thu, 23 Nov 2006 08:51:03 GMT Received: from d06av04.portsmouth.uk.ibm.com (d06av04.portsmouth.uk.ibm.com [9.149.37.216]) by d06nrmr1407.portsmouth.uk.ibm.com (8.13.6/8.13.6/NCO v8.1.1) with ESMTP id kAN8rt812527258 for ; Thu, 23 Nov 2006 08:53:55 GMT Received: from d06av04.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av04.portsmouth.uk.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id kAN8p3in010277 for ; Thu, 23 Nov 2006 08:51:03 GMT Received: from localhost (dyn-9-152-216-55.boeblingen.de.ibm.com [9.152.216.55]) by d06av04.portsmouth.uk.ibm.com (8.12.11.20060308/8.12.11) with ESMTP id kAN8p3ke010253 for ; Thu, 23 Nov 2006 08:51:03 GMT Date: Thu, 23 Nov 2006 09:49:40 +0100 From: Heiko Carstens Subject: VMALLOC_END definition? Message-ID: <20061123084940.GA8009@osiris.boeblingen.de.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm@kvack.org List-ID: Hi, I just stumbled across the VMALLOC_END definition: I'm not entirely sure what the meaning of this is: is it the last _valid_ address of the vmalloc area or is it the first address _after_ the vmalloc area? Reading the code in mm/vmalloc.c it seems to be the last valid address, which IMHO is the only thing that makes sense... how would one express the first address after 0xffffffff on a 32bit architecture? Whatever it is, it looks like half of the architectures got it wrong. We have a lot of these: e.g. powerpc: #define VMALLOC_START ASM_CONST(0xD000000000000000) #define VMALLOC_SIZE ASM_CONST(0x80000000000) #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) but also a lot of these: e.g. x86_64 #define VMALLOC_START 0xffffc20000000000UL #define VMALLOC_END 0xffffe1ffffffffffUL -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org