37 lines
1.2 KiB
Diff
37 lines
1.2 KiB
Diff
From: Dan Williams <dan.j.williams@intel.com>
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Date: Wed, 16 Mar 2016 14:16:28 +1100
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Subject: mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP
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Origin: http://article.gmane.org/gmane.linux.kernel.mm/147702
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The primary use case for devm_memremap_pages() is to allocate an memmap
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array from persistent memory. That capabilty requires vmem_altmap which
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requires SPARSEMEM_VMEMMAP.
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Also, without SPARSEMEM_VMEMMAP the addition of ZONE_DEVICE expands
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ZONES_WIDTH and triggers the:
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"Unfortunate NUMA and NUMA Balancing config, growing page-frame for
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last_cpupid."
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...warning in mm/memory.c. SPARSEMEM_VMEMMAP=n && ZONE_DEVICE=y is not
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a configuration we should worry about supporting.
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Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Reported-by: Vlastimil Babka <vbabka@suse.cz>
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Acked-by: Vlastimil Babka <vbabka@suse.cz>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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---
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mm/Kconfig | 1 +
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1 file changed, 1 insertion(+)
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--- a/mm/Kconfig
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+++ b/mm/Kconfig
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@@ -656,6 +656,7 @@ config ZONE_DEVICE
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depends on !ZONE_DMA
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depends on MEMORY_HOTPLUG
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depends on MEMORY_HOTREMOVE
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+ depends on SPARSEMEM_VMEMMAP
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depends on X86_64 #arch_add_memory() comprehends device memory
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help
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