linux-kernel - Re: [PATCH] mips: export icache_flush

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Date:	Sun, 23 Mar 2014 00:48:44 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Kees Cook <keescook@...omium.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	Ralf Baechle <ralf@...ux-mips.org>,
	Sanjay Lal <sanjayl@...asys.com>,
	John Crispin <blogic@...nwrt.org>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mips: export icache_flush_range

On 03/23/2014 12:45 AM, Sergei Shtylyov wrote:

>> The lkdtm module performs tests against executable memory ranges, so
>> it needs to flush the icache for proper behaviors. Other architectures
>> already export this, so do the same for MIPS.

>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>> This is currently untested! I'm building a MIPS cross-compiler now...
>> If someone can validate this fixes the build when lkdtm is a module,
>> that would be appreciated. :)
>> ---
>>   arch/mips/mm/cache.c |    1 +
>>   1 file changed, 1 insertion(+)

>> diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
>> index fde7e56d13fe..b3f1df13d9f6 100644
>> --- a/arch/mips/mm/cache.c
>> +++ b/arch/mips/mm/cache.c
>> @@ -38,6 +38,7 @@ void (*__flush_kernel_vmap_range)(unsigned long vaddr, int
>> size);
>>   void (*__invalidate_kernel_vmap_range)(unsigned long vaddr, int size);
>>
>>   EXPORT_SYMBOL_GPL(__flush_kernel_vmap_range);
>> +EXPORT_SYMBOL_GPL(flush_icache_range);

>     Have you run this thru scripts/checkpatch.pl? It would have told you that
> an export should immediately follow the corresponding function body, AFAIK.

    Hm, it doesn't now but definitely used to...

WBR, Sergei

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