The patch titled
Subject: mm/mm_init.c: use round_up() to calculate usermap size
has been added to the -mm mm-unstable branch. Its filename is
mm-mm_initc-use-round_up-to-calculate-usermap-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-use-round_up-to-calculate-usermap-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: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/mm_init.c: use round_up() to calculate usermap size
Date: Wed, 12 Feb 2025 01:38:18 +0000
Since pageblock_nr_pages and BITS_PER_LONG are power of 2, we could use
round_up() to calculate it.
Also we have renamed blockflags to pageblock_flags, adjust the comment
accordingly.
Link: https://lkml.kernel.org/r/20250212013818.873-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Suggested-by: Shivank Garg <shivankg@xxxxxxx>
Reviewed-by: Shivank Garg <shivankg@xxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mm_init.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/mm_init.c~mm-mm_initc-use-round_up-to-calculate-usermap-size
+++ a/mm/mm_init.c
@@ -1450,7 +1450,7 @@ void __meminit init_currently_empty_zone
#ifndef CONFIG_SPARSEMEM
/*
- * Calculate the size of the zone->blockflags rounded to an unsigned long
+ * Calculate the size of the zone->pageblock_flags rounded to an unsigned long
* Start by making sure zonesize is a multiple of pageblock_order by rounding
* up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally
* round what is now in bits to nearest long in bits, then return it in
@@ -1461,10 +1461,10 @@ static unsigned long __init usemap_size(
unsigned long usemapsize;
zonesize += zone_start_pfn & (pageblock_nr_pages-1);
- usemapsize = roundup(zonesize, pageblock_nr_pages);
+ usemapsize = round_up(zonesize, pageblock_nr_pages);
usemapsize = usemapsize >> pageblock_order;
usemapsize *= NR_PAGEBLOCK_BITS;
- usemapsize = roundup(usemapsize, BITS_PER_LONG);
+ usemapsize = round_up(usemapsize, BITS_PER_LONG);
return usemapsize / BITS_PER_BYTE;
}
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-mm_initc-use-round_up-to-align-movable-range.patch
mm-mm_initc-only-align-start-of-zone_movalbe-on-nodes-with-memory.patch
mm-mm_initc-use-round_up-to-calculate-usermap-size.patch
