Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754363Ab1FOAsX (ORCPT ); Tue, 14 Jun 2011 20:48:23 -0400 Received: from mail127.messagelabs.com ([216.82.250.115]:48766 "EHLO mail127.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753538Ab1FOAsN (ORCPT ); Tue, 14 Jun 2011 20:48:13 -0400 X-VirusChecked: Checked X-Env-Sender: hartleys@visionengravers.com X-Msg-Ref: server-10.tower-127.messagelabs.com!1308098892!8385994!1 X-StarScan-Version: 6.2.17; banners=-,-,- X-Originating-IP: [216.166.12.180] From: H Hartley Sweeten To: "linux-kernel@vger.kernel.org" CC: "linux-mm@kvack.org" , "benh@kernel.crashing.org" , "yinghai@kernel.org" , "hpa@linux.intel.com" , Andrew Morton Date: Tue, 14 Jun 2011 19:47:19 -0500 Subject: [Q] mm/memblock.c: cast truncates bits from RED_INACTIVE Thread-Topic: [Q] mm/memblock.c: cast truncates bits from RED_INACTIVE Thread-Index: Acwq9cgcVKSC4A1wQDqE/nar82cq3Q== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id p5F0mfod016902 Content-Length: 986 Lines: 25 Hello all, Sparse is reporting a couple warnings in mm/memblock.c: warning: cast truncates bits from constant value (9f911029d74e35b becomes 9d74e35b) The warnings are due to the cast of RED_INACTIVE in memblock_analyze(): /* Check marker in the unused last array entry */ WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base != (phys_addr_t)RED_INACTIVE); WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base != (phys_addr_t)RED_INACTIVE); And in memblock_init(): /* Write a marker in the unused last array entry */ memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE; memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = (phys_addr_t)RED_INACTIVE; Could this cause any problems? If not, is there anyway to quiet the sparse noise? Regards, Hartley ????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay?ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?