linux-kernel - Re: [PATCH 1/2] mm: export find_extend_vma and handle_mm

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Message-ID: <544E66B0.6030300@amd.com>
Date:	Mon, 27 Oct 2014 17:37:20 +0200
From:	Oded Gabbay <oded.gabbay@....com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Joerg Roedel <jroedel@...e.de>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm: export find_extend_vma and handle_mm_fault for
 driver use

Buy Kaveri ;)

I'm sure Intel will be happy to contribute some $$$ to AMD ;)

     Oded

On 10/27/2014 05:35 PM, Jesse Barnes wrote:

Thanks, I have no way of testing this, but I'm hopeful. :)

Jesse

On Mon, 27 Oct 2014 17:15:45 +0200
Oded Gabbay <oded.gabbay@....com> wrote:

> Sure, no problem
>
>       Oded
>
> On 10/27/2014 05:13 PM, Joerg Roedel wrote:
>
> Hi Oded,
>
> can you please test these patches with the KFD driver and make sure
> nothing breaks for you? I really like this improvement and it would be
> great to send it upstream for v3.19.
>
> Thanks,
>
> 	Joerg
>
> On Fri, Oct 24, 2014 at 12:34:30PM -0700, Jesse Barnes wrote:
>
>> This lets drivers like the AMD IOMMUv2 driver handle faults a bit more
>> simply, rather than doing tricks with page refs and get_user_pages().
>>
>> Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
>> ---
>>    mm/memory.c | 1 +
>>    mm/mmap.c   | 2 ++
>>    2 files changed, 3 insertions(+)
>>
>> diff --git a/mm/memory.c b/mm/memory.c
>> index 1cc6bfb..969ff0c 100644
>> --- a/mm/memory.c
>> +++ b/mm/memory.c
>> @@ -3378,6 +3378,7 @@ int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
>>    
>>    	return ret;
>>    }
>> +EXPORT_SYMBOL_GPL(handle_mm_fault);
>>    
>>    #ifndef __PAGETABLE_PUD_FOLDED
>>    /*
>> diff --git a/mm/mmap.c b/mm/mmap.c
>> index 7f85520..2ee7971 100644
>> --- a/mm/mmap.c
>> +++ b/mm/mmap.c
>> @@ -2359,6 +2359,8 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
>>    }
>>    #endif
>>    
>> +EXPORT_SYMBOL_GPL(find_extend_vma);
>> +
>>    /*
>>     * Ok - we have the memory areas we should free on the vma list,
>>     * so release them, and do the vma updates.
>> -- 
>> 1.9.1


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