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Commit 7afe15b9 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: simplify cpa largepage split, #3 



simplify cpa largepage split: push the reference protection bits
into the largepage-splitting function.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 5508a748

arch/x86/mm/pageattr_32.c

+5 −14
Original line number Diff line number Diff line
@@ -61,13 +61,13 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte) 
	spin_unlock_irqrestore(&pgd_lock, flags);

}



static int

split_large_page(pte_t *kpte, unsigned long address, pgprot_t ref_prot)

static int split_large_page(pte_t *kpte, unsigned long address)

{

	int i, level;

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

	unsigned long addr;

	pte_t *pbase, *tmp;

	struct page *base;

	int i, level;



	base = alloc_pages(GFP_KERNEL, 0);

	if (!base)
@@ -109,11 +109,9 @@ out_unlock: 


static int __change_page_attr(struct page *page, pgprot_t prot)

{

	pgprot_t ref_prot = PAGE_KERNEL;

	struct page *kpte_page;

	unsigned long address;

	int level, err = 0;

	pgprot_t oldprot;

	pte_t *kpte;



	BUG_ON(PageHighMem(page));
@@ -124,7 +122,6 @@ repeat: 
	if (!kpte)

		return -EINVAL;



	oldprot = pte_pgprot(*kpte);

	kpte_page = virt_to_page(kpte);

	BUG_ON(PageLRU(kpte_page));

	BUG_ON(PageCompound(kpte_page));
@@ -137,16 +134,10 @@ repeat: 
		address < (unsigned long)&_etext &&

	       (pgprot_val(prot) & _PAGE_NX));



	if ((address & LARGE_PAGE_MASK) < (unsigned long)&_etext)

		ref_prot = PAGE_KERNEL_EXEC;



	ref_prot = canon_pgprot(ref_prot);

	prot = canon_pgprot(prot);



	if (level == 3) {

		set_pte_atomic(kpte, mk_pte(page, prot));

		set_pte_atomic(kpte, mk_pte(page, canon_pgprot(prot)));

	} else {

		err = split_large_page(kpte, address, ref_prot);

		err = split_large_page(kpte, address);

		if (!err)

			goto repeat;

	}