[PATCH] avr32: fix build error in atstk1006_defconfig
Josh Wu
josh.wu at atmel.com
Tue Oct 16 06:30:50 EDT 2012
On 10/16/2012 5:17 PM, Hans-Christian Egtvedt wrote:
> 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 at atmel.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?
According to my understanding, the xxx_relaxed() is that I/O function
without any memory barriers. for Multi-cpu, the execute order are less
limited.
So the relaxed write function should be more effective than non-relaxed one.
But for single cpu, relaxed function should work same as non-relaxed
function.
Please correct me if I'm understand in a wrong way.
Best Regards,
Josh Wu
>
>> #define writeb_be __raw_writeb
>> #define writew_be __raw_writew
>> #define writel_be __raw_writel
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