From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267262AbUBMWjh (ORCPT ); Fri, 13 Feb 2004 17:39:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267263AbUBMWjg (ORCPT ); Fri, 13 Feb 2004 17:39:36 -0500 Received: from pxy1allmi.all.mi.charter.com ([24.247.15.38]:61129 "EHLO proxy1.gha.chartermi.net") by vger.kernel.org with ESMTP id S267262AbUBMWit (ORCPT ); Fri, 13 Feb 2004 17:38:49 -0500 Message-ID: <402D528E.5070105@quark.didntduck.org> Date: Fri, 13 Feb 2004 17:41:18 -0500 From: Brian Gerst User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040116 X-Accept-Language: en-us, en MIME-Version: 1.0 To: RANDAZZO@ddc-web.com CC: linux-kernel@vger.kernel.org Subject: Re: FW: spinlocks dont work References: <89760D3F308BD41183B000508BAFAC4104B16F74@DDCNYNTD> In-Reply-To: <89760D3F308BD41183B000508BAFAC4104B16F74@DDCNYNTD> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Charter-MailScanner-Information: X-Charter-MailScanner: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org RANDAZZO@ddc-web.com wrote: > On a uniprocessor system, with config_smp NOT Defined... > > Note the following example: > > driver 'A' calls spin_lock_irqsave and gets through (but does not call > ..unlock). > driver 'B' calls spin_lock_irqsave and gets through??? > > How can B get through if A did not unlock yet? > On UP, spinlocks are no-ops. -- Brian Gerst