From e751303e0ad2e998f421d104193f6904df3516d1 Mon Sep 17 00:00:00 2001 From: "Vishal Moola (Oracle)" Date: Tue, 3 Mar 2026 11:48:27 -0800 Subject: [PATCH] x86/mm/pat: Convert split_large_page() to use ptdescs Use the ptdesc APIs for all page table allocation and free sites to allow their separate allocation from struct page in the future. Update split_large_page() to allocate a ptdesc instead of allocating a page for use as a page table. Signed-off-by: Vishal Moola (Oracle) Signed-off-by: Dave Hansen Acked-by: Mike Rapoport (Microsoft) Link: https://patch.msgid.link/20260303194828.1406905-5-vishal.moola@gmail.com --- arch/x86/mm/pat/set_memory.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 17c1c28e34912..cba907c397186 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -1119,9 +1119,10 @@ set: static int __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address, - struct page *base) + struct ptdesc *ptdesc) { unsigned long lpaddr, lpinc, ref_pfn, pfn, pfninc = 1; + struct page *base = ptdesc_page(ptdesc); pte_t *pbase = (pte_t *)page_address(base); unsigned int i, level; pgprot_t ref_prot; @@ -1226,18 +1227,18 @@ __split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address, static int split_large_page(struct cpa_data *cpa, pte_t *kpte, unsigned long address) { - struct page *base; + struct ptdesc *ptdesc; if (!debug_pagealloc_enabled()) spin_unlock(&cpa_lock); - base = alloc_pages(GFP_KERNEL, 0); + ptdesc = pagetable_alloc(GFP_KERNEL, 0); if (!debug_pagealloc_enabled()) spin_lock(&cpa_lock); - if (!base) + if (!ptdesc) return -ENOMEM; - if (__split_large_page(cpa, kpte, address, base)) - __free_page(base); + if (__split_large_page(cpa, kpte, address, ptdesc)) + pagetable_free(ptdesc); return 0; } -- 2.47.3