[PATCH 5/6] mm/mm_init.c: remove unneeded calc_memmap_size()

Baoquan He
2024-03-18T14:22:12Z

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 55a2b886b7a6..9ed4b9e77c4a 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