[PATCH v2 5/6] mm/mm_init.c: remove unneeded calc_memmap_size()
From: Baoquan He <bhe@redhat.com>
Date: 2024-03-25 14:57:40
Also in:
linux-mm, lkml
Subsystem:
memblock and memory management initialization, memory management, the rest · Maintainers:
Mike Rapoport, Andrew Morton, Linus Torvalds
Nobody calls calc_memmap_size() now. Signed-off-by: Baoquan He <bhe@redhat.com> --- mm/mm_init.c | 20 -------------------- 1 file changed, 20 deletions(-)
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 7f71e56e83f3..e269a724f70e 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c@@ -1331,26 +1331,6 @@ static void __init calculate_node_totalpages(struct pglist_data *pgdat, pr_debug("On node %d totalpages: %lu\n", pgdat->node_id, realtotalpages); } -static unsigned long __init calc_memmap_size(unsigned long spanned_pages, - unsigned long present_pages) -{ - unsigned long pages = spanned_pages; - - /* - * Provide a more accurate estimation if there are holes within - * the zone and SPARSEMEM is in use. If there are holes within the - * zone, each populated memory region may cost us one or two extra - * memmap pages due to alignment because memmap pages for each - * populated regions may not be naturally aligned on page boundary. - * So the (present_pages >> 4) heuristic is a tradeoff for that. - */ - if (spanned_pages > present_pages + (present_pages >> 4) && - IS_ENABLED(CONFIG_SPARSEMEM)) - pages = present_pages; - - return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; -} - #ifdef CONFIG_TRANSPARENT_HUGEPAGE static void pgdat_init_split_queue(struct pglist_data *pgdat) {
--
2.41.0