[PATCH] fix build when CONFIG_COMPAT disabled

["Jan Beulich" <jbeulich@novell.com>]

Properly conditionalize two places where compat-only structure fields get
accessed, and avoid compiler warnings on unused variables in two other
places.

Signed-off-by: Jan Beulich <jbeulich@novell.com>

Index: 2007-01-08/xen/arch/x86/mm.c
===================================================================
--- 2007-01-08.orig/xen/arch/x86/mm.c	2007-01-09 17:00:55.000000000 +0100
+++ 2007-01-08/xen/arch/x86/mm.c	2007-01-11 15:33:22.000000000 +0100
@@ -1143,10 +1143,12 @@ static int alloc_l4_table(struct page_in
     pl4e[l4_table_offset(PERDOMAIN_VIRT_START)] =
         l4e_from_page(virt_to_page(d->arch.mm_perdomain_l3),
                       __PAGE_HYPERVISOR);
+#ifdef CONFIG_COMPAT
     if ( IS_COMPAT(d) )
         pl4e[l4_table_offset(COMPAT_ARG_XLAT_VIRT_BASE)] =
             l4e_from_page(virt_to_page(d->arch.mm_arg_xlat_l3),
                           __PAGE_HYPERVISOR);
+#endif
 
     return 1;
 
@@ -1376,7 +1378,7 @@ static int mod_l2_entry(l2_pgentry_t *pl
         if ( !l2e_has_changed(ol2e, nl2e, _PAGE_PRESENT))
             return UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, current);
 
-        if ( unlikely(!get_page_from_l2e(nl2e, pfn, current->domain)) )
+        if ( unlikely(!get_page_from_l2e(nl2e, pfn, d)) )
             return 0;
 
         if ( unlikely(!UPDATE_ENTRY(l2, pl2e, ol2e, nl2e, pfn, current)) )
@@ -1439,7 +1441,7 @@ static int mod_l3_entry(l3_pgentry_t *pl
         if (!l3e_has_changed(ol3e, nl3e, _PAGE_PRESENT))
             return UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, current);
 
-        if ( unlikely(!get_page_from_l3e(nl3e, pfn, current->domain)) )
+        if ( unlikely(!get_page_from_l3e(nl3e, pfn, d)) )
             return 0;
 
         if ( unlikely(!UPDATE_ENTRY(l3, pl3e, ol3e, nl3e, pfn, current)) )
Index: 2007-01-08/xen/include/asm-x86/config.h
===================================================================
--- 2007-01-08.orig/xen/include/asm-x86/config.h	2007-01-08 14:54:33.000000000 +0100
+++ 2007-01-08/xen/include/asm-x86/config.h	2007-01-11 15:27:04.000000000 +0100
@@ -208,7 +208,11 @@ extern unsigned long _end; /* standard E
 
 /* This is not a fixed value, just a lower limit. */
 #define __HYPERVISOR_COMPAT_VIRT_START 0xF5800000
+#ifdef CONFIG_COMPAT
 #define HYPERVISOR_COMPAT_VIRT_START(d) ((d)->arch.hv_compat_vstart)
+#else
+#define HYPERVISOR_COMPAT_VIRT_START(d) 0
+#endif
 #define MACH2PHYS_COMPAT_VIRT_START    HYPERVISOR_COMPAT_VIRT_START
 #define MACH2PHYS_COMPAT_VIRT_END      0xFFE00000
 #define MACH2PHYS_COMPAT_NR_ENTRIES(d) \