+ mm-rename-config_page_block_order-to-config_page_block_order_ceil.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: rename CONFIG_PAGE_BLOCK_ORDER to CONFIG_PAGE_BLOCK_ORDER_CEIL.
has been added to the -mm mm-new branch.  Its filename is
     mm-rename-config_page_block_order-to-config_page_block_order_ceil.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-rename-config_page_block_order-to-config_page_block_order_ceil.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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patches, and acceptance into mm-new is a notification for others take
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------------------------------------------------------
From: Zi Yan <ziy@nvidia.com>
Subject: mm: rename CONFIG_PAGE_BLOCK_ORDER to CONFIG_PAGE_BLOCK_ORDER_CEIL.
Date: Tue, 3 Jun 2025 11:48:43 -0400

The config is in fact an additional upper limit of pageblock_order, so
rename it to avoid confusion.

Link: https://lkml.kernel.org/r/20250603154843.1565239-1-ziy@nvidia.com
Fixes: e13e7922d034 ("mm: add CONFIG_PAGE_BLOCK_ORDER to select page block order")
Signed-off-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: "Isaac J. Manjarres" <isaacmanjarres@google.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: T.J. Mercier <tjmercier@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/mmzone.h          |   14 +++++++-------
 include/linux/pageblock-flags.h |    8 ++++----
 mm/Kconfig                      |   15 ++++++++-------
 3 files changed, 19 insertions(+), 18 deletions(-)

--- a/include/linux/mmzone.h~mm-rename-config_page_block_order-to-config_page_block_order_ceil
+++ a/include/linux/mmzone.h
@@ -38,19 +38,19 @@
 #define NR_PAGE_ORDERS (MAX_PAGE_ORDER + 1)
 
 /* Defines the order for the number of pages that have a migrate type. */
-#ifndef CONFIG_PAGE_BLOCK_ORDER
-#define PAGE_BLOCK_ORDER MAX_PAGE_ORDER
+#ifndef CONFIG_PAGE_BLOCK_ORDER_CEIL
+#define PAGE_BLOCK_ORDER_CEIL MAX_PAGE_ORDER
 #else
-#define PAGE_BLOCK_ORDER CONFIG_PAGE_BLOCK_ORDER
-#endif /* CONFIG_PAGE_BLOCK_ORDER */
+#define PAGE_BLOCK_ORDER_CEIL CONFIG_PAGE_BLOCK_ORDER_CEIL
+#endif /* CONFIG_PAGE_BLOCK_ORDER_CEIL */
 
 /*
  * The MAX_PAGE_ORDER, which defines the max order of pages to be allocated
- * by the buddy allocator, has to be larger or equal to the PAGE_BLOCK_ORDER,
+ * by the buddy allocator, has to be larger or equal to the PAGE_BLOCK_ORDER_CEIL,
  * which defines the order for the number of pages that can have a migrate type
  */
-#if (PAGE_BLOCK_ORDER > MAX_PAGE_ORDER)
-#error MAX_PAGE_ORDER must be >= PAGE_BLOCK_ORDER
+#if (PAGE_BLOCK_ORDER_CEIL > MAX_PAGE_ORDER)
+#error MAX_PAGE_ORDER must be >= PAGE_BLOCK_ORDER_CEIL
 #endif
 
 /*
--- a/include/linux/pageblock-flags.h~mm-rename-config_page_block_order-to-config_page_block_order_ceil
+++ a/include/linux/pageblock-flags.h
@@ -41,18 +41,18 @@ extern unsigned int pageblock_order;
  * Huge pages are a constant size, but don't exceed the maximum allocation
  * granularity.
  */
-#define pageblock_order		MIN_T(unsigned int, HUGETLB_PAGE_ORDER, PAGE_BLOCK_ORDER)
+#define pageblock_order		MIN_T(unsigned int, HUGETLB_PAGE_ORDER, PAGE_BLOCK_ORDER_CEIL)
 
 #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
 
 #elif defined(CONFIG_TRANSPARENT_HUGEPAGE)
 
-#define pageblock_order		MIN_T(unsigned int, HPAGE_PMD_ORDER, PAGE_BLOCK_ORDER)
+#define pageblock_order		MIN_T(unsigned int, HPAGE_PMD_ORDER, PAGE_BLOCK_ORDER_CEIL)
 
 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 
-/* If huge pages are not used, group by PAGE_BLOCK_ORDER */
-#define pageblock_order		PAGE_BLOCK_ORDER
+/* If huge pages are not used, group by PAGE_BLOCK_ORDER_CEIL */
+#define pageblock_order		PAGE_BLOCK_ORDER_CEIL
 
 #endif /* CONFIG_HUGETLB_PAGE */
 
--- a/mm/Kconfig~mm-rename-config_page_block_order-to-config_page_block_order_ceil
+++ a/mm/Kconfig
@@ -1005,8 +1005,8 @@ config ARCH_FORCE_MAX_ORDER
 # the default page block order is MAX_PAGE_ORDER (10) as per
 # include/linux/mmzone.h.
 #
-config PAGE_BLOCK_ORDER
-	int "Page Block Order"
+config PAGE_BLOCK_ORDER_CEIL
+	int "Page Block Order Upper Limit"
 	range 1 10 if ARCH_FORCE_MAX_ORDER = 0
 	default 10 if ARCH_FORCE_MAX_ORDER = 0
 	range 1 ARCH_FORCE_MAX_ORDER if ARCH_FORCE_MAX_ORDER != 0
@@ -1014,12 +1014,13 @@ config PAGE_BLOCK_ORDER
 	help
 	  The page block order refers to the power of two number of pages that
 	  are physically contiguous and can have a migrate type associated to
-	  them. The maximum size of the page block order is limited by
-	  ARCH_FORCE_MAX_ORDER.
+	  them. The maximum size of the page block order is at least limited by
+	  ARCH_FORCE_MAX_ORDER/MAX_PAGE_ORDER.
 
-	  This config allows overriding the default page block order when the
-	  page block order is required to be smaller than ARCH_FORCE_MAX_ORDER
-	  or MAX_PAGE_ORDER.
+	  This config adds a new upper limit of default page block
+	  order when the page block order is required to be smaller than
+	  ARCH_FORCE_MAX_ORDER/MAX_PAGE_ORDER or other limits
+	  (see include/linux/pageblock-flags.h for details).
 
 	  Reducing pageblock order can negatively impact THP generation
 	  success rate. If your workloads uses THP heavily, please use this
_

Patches currently in -mm which might be from ziy@nvidia.com are

mm-rename-config_page_block_order-to-config_page_block_order_ceil.patch