From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992449AbcB0POE (ORCPT ); Sat, 27 Feb 2016 10:14:04 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:51461 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756598AbcB0POC (ORCPT ); Sat, 27 Feb 2016 10:14:02 -0500 Date: Sat, 27 Feb 2016 16:13:57 +0100 From: Peter Zijlstra To: Arnaldo Carvalho de Melo Cc: Steven Rostedt , Ingo Molnar , Taeung Song , linux-kernel@vger.kernel.org, Jiri Olsa , Namhyung Kim , Thomas Gleixner , Lai Jiangshan Subject: Re: [RFC] Re: [PATCH v3 1/2] tracing/syscalls: Rename variable 'nr' to '__syscall_nr' Message-ID: <20160227151357.GE6356@twins.programming.kicks-ass.net> References: <1456492446-5896-1-git-send-email-treeze.taeung@gmail.com> <20160226135713.GU8720@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160226135713.GU8720@kernel.org> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 26, 2016 at 10:57:13AM -0300, Arnaldo Carvalho de Melo wrote: > Ingo, Peter, have you guys followed this case? > > Summary: Some tracepoint have multiple fields with the same name, 'nr', > the first one is a unique syscall ID, the other is a syscall > argument: I'm all for pushing the limits on tracepoint ABI. I'm all for making it less rigid. So if we can get away with changing this under the promise of helping fixup fallout, I'm all for it. That means we can always just change tracepoints, and they're not really ABI at all.