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

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Date:   Mon, 22 Nov 2021 21:48:39 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Cyril Hrubis <chrubis@...e.cz>
Cc:     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>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] uapi: Make __{u,s}64 match {u,}int64_t in userspace

On Mon, Nov 22, 2021 at 5:43 PM Cyril Hrubis <chrubis@...e.cz> wrote:
>
> +
> +#include <asm/bitsperlong.h>
> +
>  /*
> - * int-ll64 is used everywhere now.
> + * int-ll64 is used everywhere in kernel now.
>   */
> -#include <asm-generic/int-ll64.h>
> +#if __BITS_PER_LONG == 64 && !defined(__KERNEL__)
> +# include <asm-generic/int-l64.h>
> +#else
> +# include <asm-generic/int-ll64.h>
> +#endif

I don't think this is correct on all 64-bit architectures, as far as I
remember the
definition can use either 'long' or 'long long' depending on the user space
toolchain.

Out of the ten supported 64-bit architectures, there are four that already
use asm-generic/int-l64.h conditionally, and six that don't, and I
think at least
some of those are intentional.

I think it would be safer to do this one architecture at a time to make
sure this doesn't regress on those that require the int-ll64.h version.

There should also be a check for __SANE_USERSPACE_TYPES__
to let userspace ask for the ll64 version everywhere.

          Arnd