[RFC PATCH 4/6] mm/page_alloc: adjust the start, end in dax pmem kmem case
From: Jia He <hidden>
Date: 2020-07-29 03:35:46
Also in:
linux-mm, lkml, nvdimm
Subsystem:
memory management, memory management - page allocator, the rest · Maintainers:
Andrew Morton, Vlastimil Babka, Linus Torvalds
There are 3 cases when doing online pages: - normal RAM, should be aligned with memory block size - persistent memory with ZONE_DEVICE - persistent memory used as normal RAM (kmem) with ZONE_NORMAL, this patch tries to adjust the start_pfn/end_pfn after finding the corresponding resource range. Without this patch, the check of __init_single_page when doing online memory will be failed because those pages haven't been mapped in mmu(not present from mmu's point of view). Signed-off-by: Jia He <redacted> --- mm/page_alloc.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e028b87ce294..13216ab3623f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c@@ -5971,6 +5971,20 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, if (start_pfn == altmap->base_pfn) start_pfn += altmap->reserve; end_pfn = altmap->base_pfn + vmem_altmap_offset(altmap); + } else { + struct resource res; + int ret; + + /* adjust the start,end in dax pmem kmem case */ + ret = find_next_iomem_res(start_pfn << PAGE_SHIFT, + (end_pfn << PAGE_SHIFT) - 1, + IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY, + IORES_DESC_PERSISTENT_MEMORY, + false, &res); + if (!ret) { + start_pfn = PFN_UP(res.start); + end_pfn = PFN_DOWN(res.end + 1); + } } #endif
--
2.17.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel