linux-kernel - Re: [PATCH v2 2/3] ARM: Use include/asm-generic/io.h

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Message-ID: <20140711162422.GF16321@arm.com>
Date:	Fri, 11 Jul 2014 17:24:23 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Will Deacon <Will.Deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] ARM: Use include/asm-generic/io.h

On Fri, Jul 11, 2014 at 04:31:11PM +0100, Thierry Reding wrote:
> diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
> index a78562f21aab..ef54f5c8a7ae 100644
> --- a/arch/arm/include/asm/io.h
> +++ b/arch/arm/include/asm/io.h
[...]
> -#define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force __u16)cpu_to_be16(v), p); })
> -#define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); })

Aren't you losing the barrier semantics here? The generic iowrite*be()
functions call __raw_write*() directly which don't have a barrier
(write* accessors do).

-- 
Catalin
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