Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BAF42C433F5 for ; Thu, 2 Dec 2021 15:02:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358295AbhLBPF0 (ORCPT ); Thu, 2 Dec 2021 10:05:26 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:46367 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1358172AbhLBPFX (ORCPT ); Thu, 2 Dec 2021 10:05:23 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1638457321; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/3xlIYEWyvboPKd2VFHttveDDWJjCPblrUV213W3J78=; b=Gw8cNDDmjCT76z87JQuORK/Bau79gGvTgDDc8JGIWHjt6c2oJ38TB2INkk92QnRwHvABU5 ZJU1/MIlbFTRELEeqvXnB/3bnBNmLpZcBBIf7iehBopoWKnY+aO7kfq+T0whpLq7uqypYX 53lMnqkj2gBewtW2pJLaCot7IvtMkyc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-538-Z6f8F3GTO3ux06V1OWFmmg-1; Thu, 02 Dec 2021 10:01:58 -0500 X-MC-Unique: Z6f8F3GTO3ux06V1OWFmmg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6D97294EE3; Thu, 2 Dec 2021 15:01:56 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.25]) by smtp.corp.redhat.com (Postfix) with ESMTP id 256E85F4ED; Thu, 2 Dec 2021 15:01:53 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <1618289.1637686052@warthog.procyon.org.uk> To: "Zack Weinberg" Cc: dhowells@redhat.com, "Arnd Bergmann" , "Cyril Hrubis" , "linux-arch@vger.kernel.org" , libc-alpha@sourceware.org, "linux-api@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "David Laight" , "ltp@lists.linux.it" Subject: Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <913508.1638457313.1@warthog.procyon.org.uk> Date: Thu, 02 Dec 2021 15:01:53 +0000 Message-ID: <913509.1638457313@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Zack Weinberg wrote: > I could be persuaded otherwise with an example of a program for which > changing __s64 from 'long long' to 'long' would break *binary* backward > compatibility, or similarly for __u64. C++ could break. David