linux-kernel - Re: [PATCH v2] x86/io: Define readq()/writeq() to use 64-bit type

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Message-ID: <alpine.DEB.2.21.1805132007200.1582@nanos.tec.linutronix.de>
Date:   Sun, 13 May 2018 20:09:34 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc:     "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/io: Define readq()/writeq() to use 64-bit type

On Thu, 3 May 2018, Andy Shevchenko wrote:
>  #ifdef CONFIG_X86_64
>  
> -build_mmio_read(readq, "q", unsigned long, "=r", :"memory")
> -build_mmio_read(__readq, "q", unsigned long, "=r", )
> -build_mmio_write(writeq, "q", unsigned long, "r", :"memory")
> -build_mmio_write(__writeq, "q", unsigned long, "r", )
> +build_mmio_read(readq, "q", unsigned long long, "=r", :"memory")
> +build_mmio_read(__readq, "q", unsigned long long, "=r", )
> +build_mmio_write(writeq, "q", unsigned long long, "r", :"memory")
> +build_mmio_write(__writeq, "q", unsigned long long, "r", )

What's wrong with u64 which we use for expressing io access to a 64bit wide
resource?

Thanks,

	tglx