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Subject[PATCH v2] mm/sparse.c: Use kvmalloc_node/kvfree to alloc/free memmap for the classic sparse
Date
This change makes populate_section_memmap()/depopulate_section_memmap
much simpler.

Suggested-by: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Baoquan He <bhe@redhat.com>
---
v1->v2:
The old version only used __get_free_pages() to replace alloc_pages()
in populate_section_memmap().
http://lkml.kernel.org/r/20200307084229.28251-8-bhe@redhat.com

mm/sparse.c | 27 +++------------------------
1 file changed, 3 insertions(+), 24 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index bf6c00a28045..362018e82e22 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -734,35 +734,14 @@ static void free_map_bootmem(struct page *memmap)
struct page * __meminit populate_section_memmap(unsigned long pfn,
unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
{
- struct page *page, *ret;
- unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
-
- page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
- if (page)
- goto got_map_page;
-
- ret = vmalloc(memmap_size);
- if (ret)
- goto got_map_ptr;
-
- return NULL;
-got_map_page:
- ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
-got_map_ptr:
-
- return ret;
+ return kvmalloc_node(sizeof(struct page) * PAGES_PER_SECTION,
+ GFP_KERNEL|__GFP_NOWARN, nid);
}

static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
struct vmem_altmap *altmap)
{
- struct page *memmap = pfn_to_page(pfn);
-
- if (is_vmalloc_addr(memmap))
- vfree(memmap);
- else
- free_pages((unsigned long)memmap,
- get_order(sizeof(struct page) * PAGES_PER_SECTION));
+ kvfree(pfn_to_page(pfn));
}

static void free_map_bootmem(struct page *memmap)
--
2.17.2
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