The patch titled
Subject: mm/mm_init.c: remove unneeded calc_memmap_size()
has been added to the -mm mm-unstable branch. Its filename is
mm-mm_initc-remove-unneeded-calc_memmap_size.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mm_initc-remove-unneeded-calc_memmap_size.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: mm/mm_init.c: remove unneeded calc_memmap_size()
Date: Mon, 18 Mar 2024 22:21:37 +0800
Nobody calls calc_memmap_size() now.
Link: https://lkml.kernel.org/r/20240318142138.783350-6-bhe@xxxxxxxxxx
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mm_init.c | 20 --------------------
1 file changed, 20 deletions(-)
--- a/mm/mm_init.c~mm-mm_initc-remove-unneeded-calc_memmap_size
+++ a/mm/mm_init.c
@@ -1331,26 +1331,6 @@ static void __init calculate_node_totalp
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)
{
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
mm-mm_initc-remove-the-useless-dma_reserve.patch
x86-remove-memblock_find_dma_reserve.patch
mm-mm_initc-add-new-function-calc_nr_kernel_pages.patch
mm-mm_initc-remove-meaningless-calculation-of-zone-managed_pages-in-free_area_init_core.patch
mm-mm_initc-remove-unneeded-calc_memmap_size.patch
mm-mm_initc-remove-arch_reserved_kernel_pages.patch
