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Commit 63c1dcf4 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Ingo Molnar
Browse files

x86: CPA use the existing pfn in split as well 



When splitting large pages, we ge the pfn from the existing entry
instead of calculating it ourself.

This removes the last remaining range restriction of the cpa code.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 626c2c9d

arch/x86/mm/pageattr.c

+7 −4
Original line number Diff line number Diff line
@@ -221,8 +221,7 @@ static int split_large_page(pte_t *kpte, unsigned long address) 
{

	pgprot_t ref_prot = pte_pgprot(pte_clrhuge(*kpte));

	gfp_t gfp_flags = GFP_KERNEL;

	unsigned long flags;

	unsigned long addr;

	unsigned long flags, addr, pfn;

	pte_t *pbase, *tmp;

	struct page *base;

	unsigned int i, level;
@@ -253,8 +252,12 @@ static int split_large_page(pte_t *kpte, unsigned long address) 
	paravirt_alloc_pt(&init_mm, page_to_pfn(base));

#endif



	for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE)

		set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT, ref_prot));

	/*

	 * Get the target pfn from the original entry:

	 */

	pfn = pte_pfn(*kpte);

	for (i = 0; i < PTRS_PER_PTE; i++, pfn++)

		set_pte(&pbase[i], pfn_pte(pfn, ref_prot));



	/*

	 * Install the new, split up pagetable. Important detail here: