Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752878AbbETHVT (ORCPT ); Wed, 20 May 2015 03:21:19 -0400 Received: from mail-oi0-f49.google.com ([209.85.218.49]:35602 "EHLO mail-oi0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751601AbbETHVQ (ORCPT ); Wed, 20 May 2015 03:21:16 -0400 MIME-Version: 1.0 In-Reply-To: <20150519153940.GP28127@localhost> References: <1431696321-7257-1-git-send-email-grygorii.strashko@linaro.org> <20150518110214.GC28127@localhost> <5559E3C0.1040207@linaro.org> <20150518150815.GH28127@localhost> <555A0299.3030803@linaro.org> <20150519153940.GP28127@localhost> Date: Wed, 20 May 2015 09:21:16 +0200 Message-ID: Subject: Re: [PATCH] gpiolib: debugfs: display gpios requested as irq only From: Linus Walleij To: Johan Hovold Cc: "Grygorii.Strashko@linaro.org" , Alexandre Courbot , "linux-gpio@vger.kernel.org" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1254 Lines: 35 On Tue, May 19, 2015 at 5:39 PM, Johan Hovold wrote: > On Tue, May 19, 2015 at 04:12:35PM +0200, Linus Walleij wrote: >> What? If I wanted a stable interface I would use sysfs and document >> the ABI in Documentation/ABI/*. >> >> debugfs is not ABI. > > As I mentioned in my response to Grygorii, not everyone -- and most > notably apparently not even Linus Torvalds -- agrees on this: Yeah I was sloppy I guess. What I mean, precisely is that sysfs is ABI, whether documented or not. Even debugfs is actually blurry, as per Documentation/filesystems/debugfs.txt: "The debugfs filesystem is also intended to not serve as a stable ABI to user space; in theory, there are no stability constraints placed on files exported there. The real world is not always so simple, though [1]; even debugfs interfaces are best designed with the idea that they will need to be maintained forever." But I haven't been bitten by it yet so that's why I allow some poetic license. Yours, Linus Walleij -- 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/