Commit e751303e authored by Vishal Moola (Oracle)'s avatar Vishal Moola (Oracle) Committed by Dave Hansen
Browse files

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: default avatarVishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
Acked-by: default avatarMike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260303194828.1406905-5-vishal.moola@gmail.com
parent b2203a9b

arch/x86/mm/pat/set_memory.c

+7 −6
Original line number Diff line number Diff line
@@ -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;

}