Re: [PATCH V8 2/2] arm64/mm: Enable memory hot remove

[Matthew Wilcox]

On Mon, Sep 23, 2019 at 11:13:45AM +0530, Anshuman Khandual wrote:
> +#ifdef CONFIG_MEMORY_HOTPLUG
> +static void free_hotplug_page_range(struct page *page, size_t size)
> +{
> +	WARN_ON(!page || PageReserved(page));

WARN_ON(!page) isn't terribly useful.  You're going to crash on the very
next line when you call page_address() anyway.  If this line were

	if (WARN_ON(!page || PageReserved(page)))
		return;

it would make sense, or if it were just

	WARN_ON(PageReserved(page))

it would also make sense.

> +	free_pages((unsigned long)page_address(page), get_order(size));
> +}