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

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Message-ID: <YbDQW6uakG3XD8jV@yuki>
Date:   Wed, 8 Dec 2021 16:33:47 +0100
From:   Cyril Hrubis <chrubis@...e.cz>
To:     David Howells <dhowells@...hat.com>
Cc:     Zack Weinberg <zack@...folio.org>, Arnd Bergmann <arnd@...db.de>,
        "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

Hi!
> > 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.

Thinking of this again we can detect C++ as well so it can be safely
enabled just for C with:

#if !defined(__KERNEL__) && !defined(__cplusplus) && __BITSPERLONG == 64
# include <asm-generic/int-l64.h>
#else
# include <asm-generic/int-ll64.h>
#endif

-- 
Cyril Hrubis
chrubis@...e.cz