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Date: Fri, 04 Mar 2016 16:42:14 -0800 From: Dan Williams <dan.j.williams@...el.com> To: akpm@...ux-foundation.org Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz> Subject: [PATCH] mm: ZONE_DEVICE depends on SPARSEMEM_VMEMMAP The primary use case for devm_memremap_pages() is to allocate an memmap array from persistent memory. That capabilty requires vmem_altmap which requires SPARSEMEM_VMEMMAP. Also, without SPARSEMEM_VMEMMAP the addition of ZONE_DEVICE expands ZONES_WIDTH and triggers the: "Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid." ...warning in mm/memory.c. SPARSEMEM_VMEMMAP=n && ZONE_DEVICE=y is not a configuration we should worry about supporting. Reported-by: Vlastimil Babka <vbabka@...e.cz> Signed-off-by: Dan Williams <dan.j.williams@...el.com> --- mm/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/Kconfig b/mm/Kconfig index 664fa2416909..b95322ba542b 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -654,6 +654,7 @@ config ZONE_DEVICE bool "Device memory (pmem, etc...) hotplug support" if EXPERT depends on MEMORY_HOTPLUG depends on MEMORY_HOTREMOVE + depends on SPARSEMEM_VMEMMAP depends on X86_64 #arch_add_memory() comprehends device memory help
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