Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace

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To: "Zack Weinberg" <zack@xxxxxxxxxxxx>
Subject: Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
From: David Howells <dhowells@xxxxxxxxxx>
Date: Thu, 02 Dec 2021 15:01:53 +0000
Cc: dhowells@xxxxxxxxxx, "Arnd Bergmann" <arnd@xxxxxxxx>, "Cyril Hrubis" <chrubis@xxxxxxx>, "linux-arch@xxxxxxxxxxxxxxx" <linux-arch@xxxxxxxxxxxxxxx>, libc-alpha@xxxxxxxxxxxxxx, "linux-api@xxxxxxxxxxxxxxx" <linux-api@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "David Laight" <David.Laight@xxxxxxxxxx>, "ltp@xxxxxxxxxxxxxx" <ltp@xxxxxxxxxxxxxx>
In-reply-to: <b8d6f890-e5aa-44bf-8a55-5998efa05967@www.fastmail.com>
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
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Zack Weinberg <zack@xxxxxxxxxxxx> 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

Follow-Ups:
- Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: Cyril Hrubis
- Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: Zack Weinberg

References:
- Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: Zack Weinberg
- [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: Cyril Hrubis
- Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: David Howells
- RE: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: David Laight
- Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: Cyril Hrubis
- Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace
  - From: Arnd Bergmann

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