linux-kernel - Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64

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Message-ID: <913509.1638457313@warthog.procyon.org.uk>
Date:   Thu, 02 Dec 2021 15:01:53 +0000
From:   David Howells <dhowells@...hat.com>
To:     "Zack Weinberg" <zack@...folio.org>
Cc:     dhowells@...hat.com, "Arnd Bergmann" <arnd@...db.de>,
        "Cyril Hrubis" <chrubis@...e.cz>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        libc-alpha@...rceware.org,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David Laight" <David.Laight@...lab.com>,
        "ltp@...ts.linux.it" <ltp@...ts.linux.it>
Subject: Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace

Zack Weinberg <zack@...folio.org> 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