xen: fix pinning when not using split pte locks

We only pin PTE pages when using split PTE locks, so don't do the
pin/unpin when attaching/detaching pte pages to a pinned pagetable.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b106e82..8ca2f88 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -826,7 +826,7 @@ static void xen_alloc_ptpage(struct mm_struct *mm, u32 pfn, unsigned level)
 
                if (!PageHighMem(page)) {
                        make_lowmem_page_readonly(__va(PFN_PHYS((unsigned long)pfn)));
-                       if (level == PT_PTE)
+                       if (level == PT_PTE && USE_SPLIT_PTLOCKS)
                                pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
                } else
                        /* make sure there are no stray mappings of
@@ -894,7 +894,7 @@ static void xen_release_ptpage(u32 pfn, unsigned level)
 
        if (PagePinned(page)) {
                if (!PageHighMem(page)) {
-                       if (level == PT_PTE)
+                       if (level == PT_PTE && USE_SPLIT_PTLOCKS)
                                pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
                        make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
                }