linux-kernel - Re: [PATCH RFC 0/3] API for 128-bit IO access

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Date:   Wed, 24 Jan 2018 11:38:42 -0500
From:   Jeffrey Walton <noloader@...il.com>
To:     Yury Norov <ynorov@...iumnetworks.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrew Pinski <Andrew.Pinski@...ium.com>,
        Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Geethasowjanya Akula <Geethasowjanya.Akula@...ium.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Sunil Goutham <Sunil.Goutham@...ium.com>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH RFC 0/3] API for 128-bit IO access

On Wed, Jan 24, 2018 at 4:05 AM, Yury Norov <ynorov@...iumnetworks.com> wrote:
>
> ...
> With all that, this example code:
>
> static int __init 128bit_test(void)
> {
>         __uint128_t v;
>         __uint128_t addr;
>         __uint128_t val = (__uint128_t) 0x1234567890abc;
> ...

In case it matters, you can check for GCC support of the 128-bit types
in userland with:

#if (__SIZEOF_INT128__ >= 16)
   ...
#endif

Also see https://gcc.gnu.org/ml/gcc-help/2015-08/msg00185.html .

Jeff