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

[Christoph Hellwig]

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.

> --- 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.