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x86/mm/pat: Convert split_large_page() to use ptdescs

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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) <vishal.moola@gmail.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260303194828.1406905-5-vishal.moola@gmail.com
This commit is contained in:
Vishal Moola (Oracle) 2026-03-03 11:48:27 -08:00 committed by Dave Hansen
parent b2203a9bf5
commit e751303e0a
1 changed files with 7 additions and 6 deletions
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13
arch/x86/mm/pat/set_memory.c
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@ -1119,9 +1119,10 @@ static void split_set_pte(struct cpa_data *cpa, pte_t *pte, unsigned long pfn,
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;
}