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Date:   Mon, 29 Jun 2020 14:49:28 +0000 (UTC)
From:   Christopher Lameter <cl@linux.com>
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Subject: Re: [PATCH v1] mm:free unused pages in kmalloc_order
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On Mon, 29 Jun 2020, Matthew Wilcox wrote:

> Slab used to disallow GFP_HIGHMEM allocations earlier than this,

It is still not allowed and not supported.