linux-kernel - Re: [PATCH v1 10/10] mm/memory_hotplug: allow online/offline memory by a kernel module

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Message-ID: <73b34d6e-9726-e0a5-0418-65ef13f87198@redhat.com>
Date:   Thu, 24 May 2018 07:59:15 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v1 10/10] mm/memory_hotplug: allow online/offline memory
 by a kernel module

On 23.05.2018 21:51, Christoph Hellwig wrote:
> On Wed, May 23, 2018 at 05:11:51PM +0200, David Hildenbrand wrote:
>> Kernel modules that want to control how/when memory is onlined/offlined
>> need a proper interface to these functions. Also, for adding memory
>> properly, memory_block_size_bytes is required.
> 
> Which module?  Please send it along with the enabling code.

Hi,

as indicated in the cover letter, it is called "virtio-mem".
I sent it yesterday as a separate series (RFC).

Cover letter: https://lkml.org/lkml/2018/5/23/800
Relevant patch: https://lkml.org/lkml/2018/5/23/803

> 
>> --- a/drivers/base/memory.c
>> +++ b/drivers/base/memory.c
>> @@ -88,6 +88,7 @@ unsigned long __weak memory_block_size_bytes(void)
>>  {
>>  	return MIN_MEMORY_BLOCK_SIZE;
>>  }
>> +EXPORT_SYMBOL(memory_block_size_bytes);
> 
>> +EXPORT_SYMBOL(mem_hotplug_begin);
> 
>> +EXPORT_SYMBOL(mem_hotplug_done);
> 
> EXPORT_SYMBOL_GPL for any deep down VM internals, please.
> 

I continued using what was being used for symbols in this file. If there
are not other opinions, I'll switch to EXPORT_SYMBOL_GPL. Thanks!

-- 

Thanks,

David / dhildenb