Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753662AbbGOUU4 (ORCPT ); Wed, 15 Jul 2015 16:20:56 -0400 Received: from resqmta-ch2-03v.sys.comcast.net ([69.252.207.35]:38562 "EHLO resqmta-ch2-03v.sys.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753525AbbGOUUz (ORCPT ); Wed, 15 Jul 2015 16:20:55 -0400 Date: Wed, 15 Jul 2015 15:20:53 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@east.gentwo.org To: "Kirill A. Shutemov" cc: Andrew Morton , Andrea Arcangeli , Hugh Dickins , Dave Hansen , Mel Gorman , Rik van Riel , Vlastimil Babka , Naoya Horiguchi , Steve Capper , "Aneesh Kumar K.V" , Johannes Weiner , Michal Hocko , Jerome Marchand , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 04/16] page-flags: define PG_locked behavior on compound pages In-Reply-To: <1426784902-125149-5-git-send-email-kirill.shutemov@linux.intel.com> Message-ID: References: <1426784902-125149-1-git-send-email-kirill.shutemov@linux.intel.com> <1426784902-125149-5-git-send-email-kirill.shutemov@linux.intel.com> 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: 529 Lines: 13 On Thu, 19 Mar 2015, Kirill A. Shutemov wrote: > SLUB uses PG_locked as a bit spin locked. IIUC, tail pages should never > appear there. VM_BUG_ON() is added to make sure that this assumption is > correct. Its really not worth checking that AFAICT. Tail page pointers are not used. -- 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/