From f955371ca9d3986bca100666041fcfa9b6d21962 Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Tue, 7 Jan 2014 17:03:06 +0000 Subject: x86: remove the Xen-specific _PAGE_IOMAP PTE flag The _PAGE_IO_MAP PTE flag was only used by Xen PV guests to mark PTEs that were used to map I/O regions that are 1:1 in the p2m. This allowed Xen to obtain the correct PFN when converting the MFNs read from a PTE back to their PFN. Xen guests no longer use _PAGE_IOMAP for this. Instead mfn_to_pfn() returns the correct PFN by using a combination of the m2p and p2m to determine if an MFN corresponds to a 1:1 mapping in the the p2m. Remove _PAGE_IOMAP, replacing it with _PAGE_UNUSED2 to allow for future uses of the PTE flag. Signed-off-by: David Vrabel Acked-by: "H. Peter Anvin" --- arch/x86/xen/enlighten.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/x86/xen/enlighten.c') diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index c0cb11fb5008..be1cff572ccf 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1559,8 +1559,6 @@ asmlinkage __visible void __init xen_start_kernel(void) #endif __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD); - __supported_pte_mask |= _PAGE_IOMAP; - /* * Prevent page tables from being allocated in highmem, even * if CONFIG_HIGHPTE is enabled. -- cgit v1.2.3-55-g7522