From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752937AbaINRqY (ORCPT ); Sun, 14 Sep 2014 13:46:24 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:43023 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752498AbaINRqX (ORCPT ); Sun, 14 Sep 2014 13:46:23 -0400 Date: Sun, 14 Sep 2014 10:46:22 -0700 From: Greg KH To: Stephan =?iso-8859-1?Q?M=FCller?= Cc: Linux Kernel Mailing List , linux-api@vger.kernel.org Subject: Re: [PATCH] Change userspace MKDEV, MAJOR, MINOR-macros from 8+8 bit, to 12+20 bit layout Message-ID: <20140914174622.GA10315@kroah.com> References: <5415D1E0.3020905@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5415D1E0.3020905@gmail.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Sep 14, 2014 at 07:35:28PM +0200, Stephan Müller wrote: > Delete old userspace-only versions (8+8 bit). Instead expose the kernel-space > definitions (12+20 bit). > > Signed-off-by: Stephan Mueller > --- > > Browsing some code I found that user-space and kernel-space macros for (un-)packing major/minor device numbers differ. The user-space ones using still the old 16 bit scheme. There was no explaining comment around and most libraries have their own macros anyway so it should not be a problematic UAPI change. So IMHO we could win some coherence in abandon this discrepancy. > Please correct me if I am wrong. You are wrong, we can't change this api, things will break :( sorry, greg k-h