[PATCH v6 04/13] mm/vmemmap: Allow architectures to override how vmemmap optimization works

Aneesh Kumar K.V aneesh.kumar at linux.ibm.com
Tue Jul 25 05:07:50 AEST 2023

Architectures like powerpc will like to use different page table allocators
and mapping mechanisms to implement vmemmap optimization. Similar to
vmemmap_populate allow architectures to implement

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
 mm/sparse-vmemmap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index a044a130405b..a2cbe44c48e1 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -358,6 +358,7 @@ int __meminit vmemmap_populate_hugepages(unsigned long start, unsigned long end,
 	return 0;
+#ifndef vmemmap_populate_compound_pages
  * For compound pages bigger than section size (e.g. x86 1G compound
  * pages with 2M subsection size) fill the rest of sections as tail
@@ -446,6 +447,8 @@ static int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,
 	return 0;
 struct page * __meminit __populate_section_memmap(unsigned long pfn,
 		unsigned long nr_pages, int nid, struct vmem_altmap *altmap,
 		struct dev_pagemap *pgmap)

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