linux-kernel - Re: [PATCH] avr32: fix build error in atstk1006

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Message-ID: <20121016091740.GA6243@samfundet.no>
Date:	Tue, 16 Oct 2012 11:17:40 +0200
From:	Hans-Christian Egtvedt <egtvedt@...fundet.no>
To:	Josh Wu <josh.wu@...el.com>
Cc:	linux-kernel@...r.kernel.org, hskinnemoen@...il.com,
	linux-mtd@...ts.infradead.org, dedekind1@...il.com,
	fengguang.wu@...el.com
Subject: Re: [PATCH] avr32: fix build error in atstk1006_defconfig

Around Tue 16 Oct 2012 15:19:27 +0800 or thereabout, Josh Wu wrote:
> fixed the following compile error when use avr32 atstk1006_defconfig:
>   drivers/mtd/nand/atmel_nand.c: In function 'pmecc_err_location':
>   drivers/mtd/nand/atmel_nand.c:639: error: implicit declaration of function 'writel_relaxed'
> 
> which was introduced by commit 1c7b874d33b463 ("mtd: at91: atmel_nand: add Programmable Multibit ECC controller support").
> The PMECC for nand flash code uses writel_relaxed(). But in avr32, there is no macro "writel_relaxed" defined. This patch add writex_relaxed macro definitions.
> 
> Signed-off-by: Josh Wu <josh.wu@...el.com>
> ---
>  arch/avr32/include/asm/io.h |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/avr32/include/asm/io.h b/arch/avr32/include/asm/io.h
> index cf60d0a..fc6483f 100644
> --- a/arch/avr32/include/asm/io.h
> +++ b/arch/avr32/include/asm/io.h
> @@ -165,6 +165,10 @@ BUILDIO_IOPORT(l, u32)
>  #define readw_be			__raw_readw
>  #define readl_be			__raw_readl
>  
> +#define writeb_relaxed			writeb
> +#define writew_relaxed			writew
> +#define writel_relaxed			writel
> +

I'm wondering if they should be something similar to SH arch:

#define writeb_relaxed(v,c) ((void)__raw_writeb((__force u8)ioswabb(v),c))

What is the intention behind the macro? Which restriction is relaxed?

>  #define writeb_be			__raw_writeb
>  #define writew_be			__raw_writew
>  #define writel_be			__raw_writel

-- 
mvh
Hans-Christian Egtvedt
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