linux-kernel - [PATCH v3 1/3] sparc: Use vmemmap_populate_hugepages for vmemmap

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Message-ID: <20251218174749.45965-2-pilgrimtao@gmail.com>
Date: Fri, 19 Dec 2025 01:47:47 +0800
From: chengkaitao <pilgrimtao@...il.com>
To: davem@...emloft.net,
	andreas@...sler.com,
	akpm@...ux-foundation.org,
	david@...nel.org,
	lorenzo.stoakes@...cle.com,
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	mhocko@...e.com
Cc: kevin.brodsky@....com,
	dave.hansen@...ux.intel.com,
	ziy@...dia.com,
	chengkaitao@...inos.cn,
	willy@...radead.org,
	zhengqi.arch@...edance.com,
	sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH v3 1/3] sparc: Use vmemmap_populate_hugepages for vmemmap_populate

From: Chengkaitao <chengkaitao@...inos.cn>

1. In the SPARC architecture, reimplemented vmemmap_populate using
vmemmap_populate_hugepages.
2. Allow the SPARC arch to fallback to vmemmap_populate_basepages(),
when vmemmap_alloc_block returns NULL.

Signed-off-by: Chengkaitao <chengkaitao@...inos.cn>
---
 arch/sparc/mm/init_64.c | 47 ++++++++++++-----------------------------
 1 file changed, 14 insertions(+), 33 deletions(-)

diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index df9f7c444c39..f477ab1b4f08 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -2581,8 +2581,8 @@ unsigned long _PAGE_CACHE __read_mostly;
 EXPORT_SYMBOL(_PAGE_CACHE);
 
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
-int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
-			       int node, struct vmem_altmap *altmap)
+void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node,
+			       unsigned long addr, unsigned long next)
 {
 	unsigned long pte_base;
 
@@ -2595,39 +2595,20 @@ int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
 
 	pte_base |= _PAGE_PMD_HUGE;
 
-	vstart = vstart & PMD_MASK;
-	vend = ALIGN(vend, PMD_SIZE);
-	for (; vstart < vend; vstart += PMD_SIZE) {
-		pgd_t *pgd = vmemmap_pgd_populate(vstart, node);
-		unsigned long pte;
-		p4d_t *p4d;
-		pud_t *pud;
-		pmd_t *pmd;
-
-		if (!pgd)
-			return -ENOMEM;
-
-		p4d = vmemmap_p4d_populate(pgd, vstart, node);
-		if (!p4d)
-			return -ENOMEM;
-
-		pud = vmemmap_pud_populate(p4d, vstart, node);
-		if (!pud)
-			return -ENOMEM;
-
-		pmd = pmd_offset(pud, vstart);
-		pte = pmd_val(*pmd);
-		if (!(pte & _PAGE_VALID)) {
-			void *block = vmemmap_alloc_block(PMD_SIZE, node);
-
-			if (!block)
-				return -ENOMEM;
+	pmd_val(*pmd) = pte_base | __pa(p);
+}
 
-			pmd_val(*pmd) = pte_base | __pa(block);
-		}
-	}
+int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node,
+				unsigned long addr, unsigned long next)
+{
+	vmemmap_verify((pte_t *)pmdp, node, addr, next);
+	return 1;
+}
 
-	return 0;
+int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend,
+			       int node, struct vmem_altmap *altmap)
+{
+	return vmemmap_populate_hugepages(vstart, vend, node, altmap);
 }
 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
 
-- 
2.50.1 (Apple Git-155)