Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266216AbUIOOYF (ORCPT ); Wed, 15 Sep 2004 10:24:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266459AbUIOOUs (ORCPT ); Wed, 15 Sep 2004 10:20:48 -0400 Received: from mail.fh-wedel.de ([213.39.232.194]:41350 "EHLO mail.fh-wedel.de") by vger.kernel.org with ESMTP id S266233AbUIOOUK (ORCPT ); Wed, 15 Sep 2004 10:20:10 -0400 Date: Wed, 15 Sep 2004 16:18:19 +0200 From: =?iso-8859-1?Q?J=F6rn?= Engel To: Arjan van de Ven Cc: Linus Torvalds , Nick Piggin , "David S. Miller" , akpm@osdl.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH 0/3] beat kswapd with the proverbial clue-bat Message-ID: <20040915141819.GC6158@wohnheim.fh-wedel.de> References: <20040904230210.03fe3c11.davem@davemloft.net> <413AAF49.5070600@yahoo.com.au> <413AE6E7.5070103@yahoo.com.au> <1094405830.2809.8.camel@laptop.fenrus.com> <20040915132712.GA6158@wohnheim.fh-wedel.de> <20040915132904.GA30530@devserv.devel.redhat.com> <20040915133408.GB6158@wohnheim.fh-wedel.de> <20040915133939.GC30530@devserv.devel.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20040915133939.GC30530@devserv.devel.redhat.com> User-Agent: Mutt/1.3.28i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 943 Lines: 26 On Wed, 15 September 2004 15:39:39 +0200, Arjan van de Ven wrote: > > if your page is made unfreeable for the vm, for example by virtue of not > being on the LRU or having an elevated count or.. or .. then such a page is > pinned. > > if your page is freeable byt he VM and your device is dmaing from/to it you > have a really bad bug Agreed. skb->data should be safe as long as kfree_skb isn't called [1]. Thanks for the education. [1] Actually, that does cause a really bad bug, but completely unrelated to memory management. kfree_skb does more than the name indicates. Patches will follow... J?rn -- Everything should be made as simple as possible, but not simpler. -- Albert Einstein - 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/