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

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Date:	Sun, 09 Mar 2014 23:19:31 +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

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.
> 

"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.


> I will pull this into my for-linus branch, and push during the next merge
> window.
> 

OK, thanks

>> On 03/09/2014 05:35 AM, Chen Gang wrote:
>>> Need export symbol flush_icache_range() to modules, just like another
>>> platforms have done, or can not pass compiling.
>>>
>>> The related error (with allmodconfig under avr32):
>>>
>>>   ERROR: "flush_icache_range" [drivers/misc/lkdtm.ko] undefined!
>>>   make[1]: *** [__modpost] Error 1
>>>   make: *** [modules] Error 2
>>>
>>>
>>> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> 
> Acked-by: Hans-Christian Egtvedt <egtvedt@...fundet.no>
> 

OK, thanks.

>>> ---
>>>  arch/avr32/mm/cache.c | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/avr32/mm/cache.c b/arch/avr32/mm/cache.c
>>> index 6a46ecd..85d635c 100644
>>> --- a/arch/avr32/mm/cache.c
>>> +++ b/arch/avr32/mm/cache.c
>>> @@ -111,6 +111,7 @@ void flush_icache_range(unsigned long start, unsigned long end)
>>>  	__flush_icache_range(start & ~(linesz - 1),
>>>  			     (end + linesz - 1) & ~(linesz - 1));
>>>  }
>>> +EXPORT_SYMBOL(flush_icache_range);
>>>  
>>>  /*
>>>   * This one is called from __do_fault() and do_swap_page().


-- 
Chen Gang

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