x86: unify kmap_atomic_pfn() and iomap_atomic_prot_pfn(), fix

Impact: build fix

Move kmap_atomic_prot_pfn() to iomap_32.c. It is used on all 32-bit
kernels, while highmem_32.c is only built on highmem kernels.

( Note: the debug_kmap_atomic_prot() check is removed for now, that
  problem is handled via another patch. )

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Akinobu Mita <akinobu.mita@gmail.com>
LKML-Reference: <20090311143317.GA22244@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/mm/highmem_32.c

@@ -121,24 +121,8 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
 	pagefault_enable();
 }
 
-void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
-{
-	enum fixed_addresses idx;
-	unsigned long vaddr;
-
-	pagefault_disable();
-
-	debug_kmap_atomic_prot(type);
-
-	idx = type + KM_TYPE_NR * smp_processor_id();
-	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-	set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
-	arch_flush_lazy_mmu_mode();
-
-	return (void*) vaddr;
-}
-
-/* This is the same as kmap_atomic() but can map memory that doesn't
+/*
+ * This is the same as kmap_atomic() but can map memory that doesn't
  * have a struct page associated with it.
  */
 void *kmap_atomic_pfn(unsigned long pfn, enum km_type type)

arch/x86/mm/iomap_32.c

@@ -32,7 +32,23 @@ int is_io_mapping_possible(resource_size_t base, unsigned long size)
 }
 EXPORT_SYMBOL_GPL(is_io_mapping_possible);
 
-/* Map 'pfn' using fixed map 'type' and protections 'prot'
+void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)
+{
+	enum fixed_addresses idx;
+	unsigned long vaddr;
+
+	pagefault_disable();
+
+	idx = type + KM_TYPE_NR * smp_processor_id();
+	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+	set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
+	arch_flush_lazy_mmu_mode();
+
+	return (void *)vaddr;
+}
+
+/*
+ * Map 'pfn' using fixed map 'type' and protections 'prot'
  */
 void *
 iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot)