Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754632Ab0AURgP (ORCPT ); Thu, 21 Jan 2010 12:36:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754621Ab0AURgG (ORCPT ); Thu, 21 Jan 2010 12:36:06 -0500 Received: from mx1.redhat.com ([209.132.183.28]:65133 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754492Ab0AURgE (ORCPT ); Thu, 21 Jan 2010 12:36:04 -0500 Date: Thu, 21 Jan 2010 19:32:59 +0200 From: "Michael S. Tsirkin" To: Avi Kivity Cc: Davide Libenzi , mtosatti@redhat.com, kvm@vger.kernel.org, Linux Kernel Mailing List Subject: Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove Message-ID: <20100121173259.GC16707@redhat.com> References: <20100121162648.GA16458@redhat.com> <4B588B29.2050100@redhat.com> <20100121172336.GA16707@redhat.com> <4B588FCE.7030803@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4B588FCE.7030803@redhat.com> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 836 Lines: 24 On Thu, Jan 21, 2010 at 07:33:02PM +0200, Avi Kivity wrote: > On 01/21/2010 07:23 PM, Michael S. Tsirkin wrote: >> >>> I agree. >>> >>> But I think we can solve this in another way in .32: we can clear the >>> eventfd from irqfd->inject work, which is in process context. The new >>> stuff is only needed for lockless clearing, no? >>> >> No, AFAIK there's no way to clear the counter from kernel without >> this patch. >> > > Can't you read from the file? IMO no, the read could block. > -- > Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- 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/