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Subject: Re: [PATCH 2/5] mm/memory_hotplug: Create add/del_device_memory
 functions
To:     Oscar Salvador <osalvador@techadventures.net>
Cc:     akpm@linux-foundation.org, mhocko@suse.com,
        dan.j.williams@intel.com, yasu.isimatu@gmail.com,
        rppt@linux.vnet.ibm.com, malat@debian.org,
        linux-kernel@vger.kernel.org, pavel.tatashin@microsoft.com,
        jglisse@redhat.com, Jonathan.Cameron@huawei.com, rafael@kernel.org,
        dave.jiang@intel.com, linux-mm@kvack.org,
        alexander.h.duyck@linux.intel.com,
        Oscar Salvador <osalvador@suse.de>
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 <d0a12eb5-3824-8d25-75f8-3e62f1e81994@redhat.com>
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From:   David Hildenbrand <david@redhat.com>
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Organization: Red Hat GmbH
Message-ID: <883d3ab7-b2df-9b9a-7681-1019ce3b9e18@redhat.com>
Date:   Wed, 17 Oct 2018 11:45:50 +0200
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On 17/10/2018 11:33, Oscar Salvador wrote:
>>>  	/*
>>>  	 * For device private memory we call add_pages() as we only need to
>>>  	 * allocate and initialize struct page for the device memory. More-
>>> @@ -1096,20 +1100,17 @@ static int hmm_devmem_pages_create(struct hmm_devmem *devmem)
>>>  	 * want the linear mapping and thus use arch_add_memory().
>>>  	 */
>>
>> Some parts of this comment should be moved into add_device_memory now.
>> (e.g. we call add_pages() ...)
> 
> I agree.
> 
>>> +#ifdef CONFIG_ZONE_DEVICE
>>> +int del_device_memory(int nid, unsigned long start, unsigned long size,
>>> +				struct vmem_altmap *altmap, bool mapping)
>>> +{
>>> +	int ret;
>>
>> nit: personally I prefer short parameters last in the list.
> 
> I do not have a strong opinion here.
> If people think that long parameters should be placed at the end because
> it improves readability, I am ok with moving them there.
>  
>> Can you document for both functions that they should be called with the
>> memory hotplug lock in write?
> 
> Sure, I will do that in the next version, once I get some more feedback.
> 
>> Apart from that looks good to me.
> 
> Thanks for reviewing it David ;-)!
> May I assume your Reviewed-by here (if the above comments are addressed)?

Here you go ;)

Reviewed-by: David Hildenbrand <david@redhat.com>

I'm planning to look into the other patches as well, but I'll be busy
with traveling and KVM forum the next 1.5 weeks.

Cheers!


-- 

Thanks,

David / dhildenb