The patch titled
Subject: mm/page_alloc.c: change the array-length to MIGRATE_PCPTYPES
has been added to the -mm mm-unstable branch. Its filename is
mm-page_allocc-change-the-array-length-to-migrate_pcptypes.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_allocc-change-the-array-length-to-migrate_pcptypes.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/page_alloc.c: change the array-length to MIGRATE_PCPTYPES
Date: Tue, 26 Mar 2024 14:11:33 +0800
Earlier, in commit 1dd214b8f21c ("mm: page_alloc: avoid merging
non-fallbackable pageblocks with others"), migrate type MIGRATE_CMA and
MIGRATE_ISOLATE are removed from fallbacks list since they are never used.
Later on, in commit ("aa02d3c174ab mm/page_alloc: reduce fallbacks to
(MIGRATE_PCPTYPES - 1)"), the array column size is reduced to
'MIGRATE_PCPTYPES - 1'. In fact, the array row size need be reduced to
MIGRATE_PCPTYPES too since it's only covering rows of the number
MIGRATE_PCPTYPES. Even though the current code has handled cases
when the migratetype is CMA, HIGHATOMIC and MEMORY_ISOLATION, making
the row size right is still good to avoid future error and confusion.
Link: https://lkml.kernel.org/r/20240326061134.1055295-8-bhe@xxxxxxxxxx
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_allocc-change-the-array-length-to-migrate_pcptypes
+++ a/mm/page_alloc.c
@@ -1545,7 +1545,7 @@ struct page *__rmqueue_smallest(struct z
*
* The other migratetypes do not have fallbacks.
*/
-static int fallbacks[MIGRATE_TYPES][MIGRATE_PCPTYPES - 1] = {
+static int fallbacks[MIGRATE_PCPTYPES][MIGRATE_PCPTYPES - 1] = {
[MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE },
[MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE },
[MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE },
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
mm-vmallocc-optimize-to-reduce-arguments-of-alloc_vmap_area.patch
x86-remove-unneeded-memblock_find_dma_reserve.patch
mm-mm_initc-remove-the-useless-dma_reserve.patch
mm-mm_initc-add-new-function-calc_nr_all_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
mm-move-array-mem_section-init-code-out-of-memory_present.patch
mm-init-remove-the-unnecessary-special-treatment-for-memory-less-node.patch
mm-make-__absent_pages_in_range-as-static.patch
mm-page_allocc-remove-unneeded-codes-in-numa-version-of-build_zonelists.patch
mm-mm_initc-remove-the-outdated-code-comment-above-deferred_grow_zone.patch
mm-page_allocc-dont-show-protection-in-zones-lowmem_reserve-for-empty-zone.patch
mm-page_allocc-change-the-array-length-to-migrate_pcptypes.patch
