Commit 1f4f9315 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by H. Peter Anvin
Browse files

xen: fix 32-bit build resulting from mmu move 



Moving the mmu code from enlighten.c to mmu.c inadvertently broke the
32-bit build.  Fix it.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 0eb592db

arch/x86/xen/mmu.c

+37 −0
Original line number Diff line number Diff line
@@ -1396,6 +1396,43 @@ static void xen_pgd_free(struct mm_struct *mm, pgd_t *pgd) 
#endif

}



#ifdef CONFIG_HIGHPTE

static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)

{

	pgprot_t prot = PAGE_KERNEL;



	if (PagePinned(page))

		prot = PAGE_KERNEL_RO;



	if (0 && PageHighMem(page))

		printk("mapping highpte %lx type %d prot %s\n",

		       page_to_pfn(page), type,

		       (unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ");



	return kmap_atomic_prot(page, type, prot);

}

#endif



#ifdef CONFIG_X86_32

static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)

{

	/* If there's an existing pte, then don't allow _PAGE_RW to be set */

	if (pte_val_ma(*ptep) & _PAGE_PRESENT)

		pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &

			       pte_val_ma(pte));



	return pte;

}



/* Init-time set_pte while constructing initial pagetables, which

   doesn't allow RO pagetable pages to be remapped RW */

static __init void xen_set_pte_init(pte_t *ptep, pte_t pte)

{

	pte = mask_rw_pte(ptep, pte);



	xen_set_pte(ptep, pte);

}

#endif



/* Early in boot, while setting up the initial pagetable, assume

   everything is pinned. */