linux-kernel - Re: [PATCH] arch/avr32/mm/cache.c: export symbol flush_icache

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Date:	Sun, 23 Mar 2014 07:12:46 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	Hans-Christian Egtvedt <egtvedt@...fundet.no>
CC:	Håvard Skinnemoen <hskinnemoen@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arch/avr32/mm/cache.c: export symbol flush_icache_range()
 for module using


Is this patch OK?

If it is necessary to continue analysing more details, please let me
know, and I will/should continue.

Thanks.

On 03/16/2014 05:18 AM, Chen Gang wrote:
> On 03/09/2014 11:19 PM, Chen Gang wrote:
>> On 03/09/2014 06:17 AM, Hans-Christian Egtvedt wrote:
>>> Around Sun 09 Mar 2014 05:47:04 +0800 or thereabout, Chen Gang wrote:
>>>>
>>>> After this patch, our linux kernel can pass "avr32-linux-" allmodconfig
>>>> (it contents quite a few of warnings, but after check, I guess they are
>>>> not kernel's issue).
>>>
>>> That sounds great, I am a bit surprised however that the lkdtm module need
>>> flush_icache_range. Would have been interesting to look into what causes this
>>> dependency.
>>>
> 
> After read a little more details for lkdtm, I guess "after overwrite an
> executable area by do_nothing(), it needs flush_icache_range() to be
> sure the new instructions/data must have effect with all cpu".
> 
> Welcome any additional information for it.
> 
> Thanks.
> 
>>
>> "driver/misc/lkdtm.c" will use this flush_icache_range().
>>
>> And some architectures export it to modules.
>>
>>   [root@...en arch]# grep -rn flush_icache_range * | grep EXPORT
>>   arm64/mm/flush.c:105:EXPORT_SYMBOL(flush_icache_range);
>>   avr32/mm/cache.c:114:EXPORT_SYMBOL(flush_icache_range);
>>   m68k/mm/cache.c:106:EXPORT_SYMBOL(flush_icache_range);
>>   mn10300/mm/cache-inv-icache.c:129:EXPORT_SYMBOL(flush_icache_range);
>>   mn10300/mm/cache-flush-icache.c:155:EXPORT_SYMBOL(flush_icache_range);
>>   sparc/mm/init_64.c:435:EXPORT_SYMBOL(flush_icache_range);
>>
>>
>> Welcome any more details information by any other members, thanks.
>>
>>
> 
> Thanks.
> 


-- 
Chen Gang

Open, share and attitude like air, water and life which God blessed
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