x86: put all kern_addr_valid() incarnations to pgtable.h

Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

include/asm-x86/mmzone_32.h

@@ -87,9 +87,6 @@ static inline int pfn_to_nid(unsigned long pfn)
 	__pgdat->node_start_pfn + __pgdat->node_spanned_pages;		\
 })
 
-/* XXX: FIXME -- wli */
-#define kern_addr_valid(kaddr)	(0)
-
 #ifdef CONFIG_X86_NUMAQ            /* we have contiguous memory on NUMA-Q */
 #define pfn_valid(pfn)          ((pfn) < num_physpages)
 #else

include/asm-x86/pgtable_32.h

@@ -497,9 +497,15 @@ static inline void paravirt_pagetable_setup_done(pgd_t *base)
 
 #endif /* !__ASSEMBLY__ */
 
+/*
+ * kern_addr_valid() is (1) for FLATMEM and (0) for
+ * SPARSEMEM and DISCONTIGMEM
+ */
 #ifdef CONFIG_FLATMEM
 #define kern_addr_valid(addr)	(1)
-#endif /* CONFIG_FLATMEM */
+#else
+#define kern_addr_valid(kaddr)	(0)
+#endif
 
 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
 		remap_pfn_range(vma, vaddr, pfn, size, prot)

include/asm-x86/sparsemem_32.h

@@ -24,8 +24,5 @@
 #define MAX_PHYSMEM_BITS	32
 #endif
 
-/* XXX: FIXME -- wli */
-#define kern_addr_valid(kaddr)  (0)
-
 #endif /* CONFIG_SPARSEMEM */
 #endif /* _I386_SPARSEMEM_H */