mm, treewide: rename MAX_ORDER to MAX_PAGE_ORDER

commit 23baf831a32c ("mm, treewide: redefine MAX_ORDER sanely") has
changed the definition of MAX_ORDER to be inclusive.  This has caused
issues with code that was not yet upstream and depended on the previous
definition.

To draw attention to the altered meaning of the define, rename MAX_ORDER
to MAX_PAGE_ORDER.

Link: https://lkml.kernel.org/r/20231228144704.14033-2-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

17 files changed, 29 insertions, 28 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f8567e95f98b..b2ab8db63c4b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1362,7 +1362,7 @@ config ARCH_FORCE_MAX_ORDER
 	default "10"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 12d611f3da5d..442539fd06fe 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1520,15 +1520,15 @@ config XEN
 
 # include/linux/mmzone.h requires the following to be true:
 #
-#   MAX_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS
+#   MAX_PAGE_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS
 #
-# so the maximum value of MAX_ORDER is SECTION_SIZE_BITS - PAGE_SHIFT:
+# so the maximum value of MAX_PAGE_ORDER is SECTION_SIZE_BITS - PAGE_SHIFT:
 #
-#     | SECTION_SIZE_BITS |  PAGE_SHIFT  |  max MAX_ORDER  |  default MAX_ORDER |
-# ----+-------------------+--------------+-----------------+--------------------+
-# 4K  |       27          |      12      |       15        |         10         |
-# 16K |       27          |      14      |       13        |         11         |
-# 64K |       29          |      16      |       13        |         13         |
+#     | SECTION_SIZE_BITS |  PAGE_SHIFT  |  max MAX_PAGE_ORDER  |  default MAX_PAGE_ORDER |
+# ----+-------------------+--------------+----------------------+-------------------------+
+# 4K  |       27          |      12      |       15             |         10              |
+# 16K |       27          |      14      |       13             |         11              |
+# 64K |       29          |      16      |       13             |         13              |
 config ARCH_FORCE_MAX_ORDER
 	int
 	default "13" if ARM64_64K_PAGES
@@ -1536,16 +1536,16 @@ config ARCH_FORCE_MAX_ORDER
 	default "10"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very
 	  large blocks of physically contiguous memory is required.
 
 	  The maximal size of allocation cannot exceed the size of the
-	  section, so the value of MAX_ORDER should satisfy
+	  section, so the value of MAX_PAGE_ORDER should satisfy
 
-	    MAX_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS
+	    MAX_PAGE_ORDER + PAGE_SHIFT <= SECTION_SIZE_BITS
 
 	  Don't change if unsure.
 
diff --git a/arch/arm64/include/asm/sparsemem.h b/arch/arm64/include/asm/sparsemem.h
index 5f5437621029..8a8acc220371 100644
--- a/arch/arm64/include/asm/sparsemem.h
+++ b/arch/arm64/include/asm/sparsemem.h
@@ -10,7 +10,7 @@
 /*
  * Section size must be at least 512MB for 64K base
  * page size config. Otherwise it will be less than
- * MAX_ORDER and the build process will fail.
+ * MAX_PAGE_ORDER and the build process will fail.
  */
 #ifdef CONFIG_ARM64_64K_PAGES
 #define SECTION_SIZE_BITS 29
diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
index b1e392186a0f..e691290d3765 100644
--- a/arch/arm64/kvm/hyp/nvhe/page_alloc.c
+++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c
@@ -228,7 +228,8 @@ int hyp_pool_init(struct hyp_pool *pool, u64 pfn, unsigned int nr_pages,
 	int i;
 
 	hyp_spin_lock_init(&pool->lock);
-	pool->max_order = min(MAX_ORDER, get_order(nr_pages << PAGE_SHIFT));
+	pool->max_order = min(MAX_PAGE_ORDER,
+			      get_order(nr_pages << PAGE_SHIFT));
 	for (i = 0; i <= pool->max_order; i++)
 		INIT_LIST_HEAD(&pool->free_area[i]);
 	pool->range_start = phys;
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index f5aae342632c..8116ac599f80 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -51,7 +51,7 @@ void __init arm64_hugetlb_cma_reserve(void)
 	 * page allocator. Just warn if there is any change
 	 * breaking this assumption.
 	 */
-	WARN_ON(order <= MAX_ORDER);
+	WARN_ON(order <= MAX_PAGE_ORDER);
 	hugetlb_cma_reserve(order);
 }
 #endif /* CONFIG_CMA */
diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
index ad69b466a08b..9dcf245c9cbf 100644
--- a/arch/m68k/Kconfig.cpu
+++ b/arch/m68k/Kconfig.cpu
@@ -402,7 +402,7 @@ config ARCH_FORCE_MAX_ORDER
 	default "10"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index d54464021a61..58d9565dc2c7 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -50,7 +50,7 @@ config ARCH_FORCE_MAX_ORDER
 	default "10"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 1f11a62809f2..52d7e3fad553 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -915,7 +915,7 @@ config ARCH_FORCE_MAX_ORDER
 	default "10"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very
diff --git a/arch/powerpc/mm/book3s64/iommu_api.c b/arch/powerpc/mm/book3s64/iommu_api.c
index d19fb1f3007d..c0e8d597e4cb 100644
--- a/arch/powerpc/mm/book3s64/iommu_api.c
+++ b/arch/powerpc/mm/book3s64/iommu_api.c
@@ -97,7 +97,7 @@ static long mm_iommu_do_alloc(struct mm_struct *mm, unsigned long ua,
 	}
 
 	mmap_read_lock(mm);
-	chunk = (1UL << (PAGE_SHIFT + MAX_ORDER)) /
+	chunk = (1UL << (PAGE_SHIFT + MAX_PAGE_ORDER)) /
 			sizeof(struct vm_area_struct *);
 	chunk = min(chunk, entries);
 	for (entry = 0; entry < entries; entry += chunk) {
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index f7c683b672c1..0a540b37aab6 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -615,7 +615,7 @@ void __init gigantic_hugetlb_cma_reserve(void)
 		order = mmu_psize_to_shift(MMU_PAGE_16G) - PAGE_SHIFT;
 
 	if (order) {
-		VM_WARN_ON(order <= MAX_ORDER);
+		VM_WARN_ON(order <= MAX_PAGE_ORDER);
 		hugetlb_cma_reserve(order);
 	}
 }
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 28fac4770073..23f5b5093ec1 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1389,7 +1389,7 @@ static long pnv_pci_ioda2_setup_default_config(struct pnv_ioda_pe *pe)
 	 * DMA window can be larger than available memory, which will
 	 * cause errors later.
 	 */
-	const u64 maxblock = 1UL << (PAGE_SHIFT + MAX_ORDER);
+	const u64 maxblock = 1UL << (PAGE_SHIFT + MAX_PAGE_ORDER);
 
 	/*
 	 * We create the default window as big as we can. The constraint is
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 511c17aede4a..455311d9a5e9 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -26,7 +26,7 @@ config ARCH_FORCE_MAX_ORDER
 	default "10"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE:_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 49849790e66d..204c43cb3d43 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -277,7 +277,7 @@ config ARCH_FORCE_MAX_ORDER
 	default "12"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index c80b0a21d709..083e5f05a7f0 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -194,7 +194,7 @@ static void *dma_4v_alloc_coherent(struct device *dev, size_t size,
 
 	size = IO_PAGE_ALIGN(size);
 	order = get_order(size);
-	if (unlikely(order > MAX_ORDER))
+	if (unlikely(order > MAX_PAGE_ORDER))
 		return NULL;
 
 	npages = size >> IO_PAGE_SHIFT;
diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c
index 5e2931a18409..6acd8a4c1e2a 100644
--- a/arch/sparc/mm/tsb.c
+++ b/arch/sparc/mm/tsb.c
@@ -402,8 +402,8 @@ void tsb_grow(struct mm_struct *mm, unsigned long tsb_index, unsigned long rss)
 	unsigned long new_rss_limit;
 	gfp_t gfp_flags;
 
-	if (max_tsb_size > PAGE_SIZE << MAX_ORDER)
-		max_tsb_size = PAGE_SIZE << MAX_ORDER;
+	if (max_tsb_size > PAGE_SIZE << MAX_PAGE_ORDER)
+		max_tsb_size = PAGE_SIZE << MAX_PAGE_ORDER;
 
 	new_cache_index = 0;
 	for (new_size = 8192; new_size < max_tsb_size; new_size <<= 1UL) {
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index b1bfed0c8528..7a9820797eae 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -373,10 +373,10 @@ int __init linux_main(int argc, char **argv)
 	max_physmem = TASK_SIZE - uml_physmem - iomem_size - MIN_VMALLOC;
 
 	/*
-	 * Zones have to begin on a 1 << MAX_ORDER page boundary,
+	 * Zones have to begin on a 1 << MAX_PAGE_ORDER page boundary,
 	 * so this makes sure that's true for highmem
 	 */
-	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_ORDER)) - 1);
+	max_physmem &= ~((1 << (PAGE_SHIFT + MAX_PAGE_ORDER)) - 1);
 	if (physmem_size + iomem_size > max_physmem) {
 		highmem = physmem_size + iomem_size - max_physmem;
 		physmem_size -= highmem;
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 7d792077e5fd..e031eaf36c99 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -793,7 +793,7 @@ config ARCH_FORCE_MAX_ORDER
 	default "10"
 	help
 	  The kernel page allocator limits the size of maximal physically
-	  contiguous allocations. The limit is called MAX_ORDER and it
+	  contiguous allocations. The limit is called MAX_PAGE_ORDER and it
 	  defines the maximal power of two of number of pages that can be
 	  allocated as a single contiguous block. This option allows
 	  overriding the default setting when ability to allocate very