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

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Date:   Tue, 23 Nov 2021 20:50:31 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Cyril Hrubis <chrubis@...e.cz>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        LTP List <ltp@...ts.linux.it>,
        GNU C Library <libc-alpha@...rceware.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace

* Cyril Hrubis:

> As far as I can tell the userspace bits/types.h does exactly the same
> check in order to define uint64_t and int64_t, i.e.:
>
> #if __WORDSIZE == 64
> typedef signed long int __int64_t;
> typedef unsigned long int __uint64_t;
> #else
> __extension__ typedef signed long long int __int64_t;
> __extension__ typedef unsigned long long int __uint64_t;
> #endif
>
> The macro __WORDSIZE is defined per architecture, and it looks like the
> defintions in glibc sources in bits/wordsize.h match the uapi
> asm/bitsperlong.h. But I may have missed something, the code in glibc is
> not exactly easy to read.

__WORDSIZE isn't exactly a standard libc macro.

On musl, x86-64 x32 has __WORDSIZE == 64 depending on header-inclusion
order, but that's probably just a bug.

Thanks,
Florian