linux-kernel - [PATCH] mm: prefer xxx_page() alloc/free functions for order-0 pages

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Date:   Mon, 13 Mar 2023 12:27:14 +0000
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        David Hildenbrand <david@...hat.com>,
        Nick Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lorenzo Stoakes <lstoakes@...il.com>
Subject: [PATCH] mm: prefer xxx_page() alloc/free functions for order-0 pages

Update instances of alloc_pages(..., 0), __get_free_pages(..., 0) and
__free_pages(..., 0) to use alloc_page(), __get_free_page() and
__free_page() respectively in core code.

Signed-off-by: Lorenzo Stoakes <lstoakes@...il.com>
---
 include/asm-generic/pgalloc.h | 4 ++--
 mm/debug_vm_pgtable.c         | 4 ++--
 mm/hugetlb_vmemmap.c          | 2 +-
 mm/mmu_gather.c               | 2 +-
 mm/page_alloc.c               | 2 +-
 mm/vmalloc.c                  | 2 +-
 6 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h
index 977bea16cf1b..a7cf825befae 100644
--- a/include/asm-generic/pgalloc.h
+++ b/include/asm-generic/pgalloc.h
@@ -123,11 +123,11 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)

 	if (mm == &init_mm)
 		gfp = GFP_PGTABLE_KERNEL;
-	page = alloc_pages(gfp, 0);
+	page = alloc_page(gfp);
 	if (!page)
 		return NULL;
 	if (!pgtable_pmd_page_ctor(page)) {
-		__free_pages(page, 0);
+		__free_page(page);
 		return NULL;
 	}
 	return (pmd_t *)page_address(page);
diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
index 7887cc2b75bf..4362021b1ce7 100644
--- a/mm/debug_vm_pgtable.c
+++ b/mm/debug_vm_pgtable.c
@@ -1048,7 +1048,7 @@ static void __init destroy_args(struct pgtable_debug_args *args)

 	if (args->pte_pfn != ULONG_MAX) {
 		page = pfn_to_page(args->pte_pfn);
-		__free_pages(page, 0);
+		__free_page(page);

 		args->pte_pfn = ULONG_MAX;
 	}
@@ -1290,7 +1290,7 @@ static int __init init_args(struct pgtable_debug_args *args)
 		}
 	}

-	page = alloc_pages(GFP_KERNEL, 0);
+	page = alloc_page(GFP_KERNEL);
 	if (page)
 		args->pte_pfn = page_to_pfn(page);

diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c
index a15cc56cf70a..1198064f80eb 100644
--- a/mm/hugetlb_vmemmap.c
+++ b/mm/hugetlb_vmemmap.c
@@ -400,7 +400,7 @@ static int alloc_vmemmap_page_list(unsigned long start, unsigned long end,
 	return 0;
 out:
 	list_for_each_entry_safe(page, next, list, lru)
-		__free_pages(page, 0);
+		__free_page(page);
 	return -ENOMEM;
 }

diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c
index 2b93cf6ac9ae..ea9683e12936 100644
--- a/mm/mmu_gather.c
+++ b/mm/mmu_gather.c
@@ -32,7 +32,7 @@ static bool tlb_next_batch(struct mmu_gather *tlb)
 	if (tlb->batch_count == MAX_GATHER_BATCH_COUNT)
 		return false;

-	batch = (void *)__get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
+	batch = (void *)__get_free_page(GFP_NOWAIT | __GFP_NOWARN);
 	if (!batch)
 		return false;

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 680a4d76460e..256e8d3c8742 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5538,7 +5538,7 @@ EXPORT_SYMBOL(__get_free_pages);

 unsigned long get_zeroed_page(gfp_t gfp_mask)
 {
-	return __get_free_pages(gfp_mask | __GFP_ZERO, 0);
+	return __get_free_page(gfp_mask | __GFP_ZERO);
 }
 EXPORT_SYMBOL(get_zeroed_page);

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 5e60e9792cbf..978194dc2bb8 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2739,7 +2739,7 @@ void vfree(const void *addr)
 		 * High-order allocs for huge vmallocs are split, so
 		 * can be freed as an array of order-0 allocations
 		 */
-		__free_pages(page, 0);
+		__free_page(page);
 		cond_resched();
 	}
 	atomic_long_sub(vm->nr_pages, &nr_vmalloc_pages);
--
2.39.2