linux-kernel - [PATCH 1/2] mm/vmalloc: Add large-order allocation helper

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Message-ID: <20251216211921.1401147-1-urezki@gmail.com>
Date: Tue, 16 Dec 2025 22:19:20 +0100
From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
To: linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: Vishal Moola <vishal.moola@...il.com>,
	Ryan Roberts <ryan.roberts@....com>,
	Dev Jain <dev.jain@....com>,
	Baoquan He <bhe@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Uladzislau Rezki <urezki@...il.com>
Subject: [PATCH 1/2] mm/vmalloc: Add large-order allocation helper

Refactor vm_area_alloc_pages() by moving the high-order allocation
code into a separate function, vm_area_alloc_pages_large_order().

No functional changes.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 mm/vmalloc.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ecbac900c35f..d3a4725e15ca 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3624,18 +3624,20 @@ static inline gfp_t vmalloc_gfp_adjust(gfp_t flags, const bool large)
 	return flags;
 }
 
-static inline unsigned int
-vm_area_alloc_pages(gfp_t gfp, int nid,
-		unsigned int order, unsigned int nr_pages, struct page **pages)
+static unsigned int
+vm_area_alloc_pages_large_order(gfp_t gfp, int nid, unsigned int order,
+		unsigned int nr_pages, struct page **pages)
 {
 	unsigned int nr_allocated = 0;
 	unsigned int nr_remaining = nr_pages;
 	unsigned int max_attempt_order = MAX_PAGE_ORDER;
 	struct page *page;
+	unsigned int large_order;
+	gfp_t large_gfp;
 	int i;
-	unsigned int large_order = ilog2(nr_remaining);
-	gfp_t large_gfp = vmalloc_gfp_adjust(gfp, large_order) & ~__GFP_DIRECT_RECLAIM;
 
+	large_order = ilog2(nr_remaining);
+	large_gfp = vmalloc_gfp_adjust(gfp, large_order) & ~__GFP_DIRECT_RECLAIM;
 	large_order = min(max_attempt_order, large_order);
 
 	/*
@@ -3666,6 +3668,20 @@ vm_area_alloc_pages(gfp_t gfp, int nid,
 		large_order = min(max_attempt_order, large_order);
 	}
 
+	return nr_allocated;
+}
+
+static inline unsigned int
+vm_area_alloc_pages(gfp_t gfp, int nid,
+		unsigned int order, unsigned int nr_pages, struct page **pages)
+{
+	unsigned int nr_allocated = 0;
+	struct page *page;
+	int i;
+
+	nr_allocated = vm_area_alloc_pages_large_order(gfp, nid,
+		order, nr_pages, pages);
+
 	/*
 	 * For order-0 pages we make use of bulk allocator, if
 	 * the page array is partly or not at all populated due
-- 
2.47.3