[ARM] fix naming of MODULE_START / MODULE_END

As of 73bdf0a60e607f4b8ecc5aec597105976565a84f, the kernel needs
to know where modules are located in the virtual address space.
On ARM, we located this region between MODULE_START and MODULE_END.
Unfortunately, everyone else calls it MODULES_VADDR and MODULES_END.
Update ARM to use the same naming, so is_vmalloc_or_module_addr()
can work properly.  Also update the comment on mm/vmalloc.c to
reflect that ARM also places modules in a separate region from the
vmalloc space.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/memory.h

@@ -44,10 +44,10 @@
  * The module space lives between the addresses given by TASK_SIZE
  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  */
-#define MODULE_END		(PAGE_OFFSET)
-#define MODULE_START		(MODULE_END - 16*1048576)
+#define MODULES_END		(PAGE_OFFSET)
+#define MODULES_VADDR		(MODULES_END - 16*1048576)
 
-#if TASK_SIZE > MODULE_START
+#if TASK_SIZE > MODULES_VADDR
 #error Top of user space clashes with start of module space
 #endif
 
@@ -56,7 +56,7 @@
  * Since we use sections to map it, this macro replaces the physical address
  * with its virtual address while keeping offset from the base section.
  */
-#define XIP_VIRT_ADDR(physaddr)  (MODULE_START + ((physaddr) & 0x000fffff))
+#define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
 
 /*
  * Allow 16MB-aligned ioremap pages
@@ -94,8 +94,8 @@
 /*
  * The module can be at any place in ram in nommu mode.
  */
-#define MODULE_END		(END_MEM)
-#define MODULE_START		(PHYS_OFFSET)
+#define MODULES_END		(END_MEM)
+#define MODULES_VADDR		(PHYS_OFFSET)
 
 #endif /* !CONFIG_MMU */
 

arch/arm/kernel/module.c

@@ -26,12 +26,12 @@
 /*
  * The XIP kernel text is mapped in the module area for modules and
  * some other stuff to work without any indirect relocations.
- * MODULE_START is redefined here and not in asm/memory.h to avoid
+ * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
  * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
  */
 extern void _etext;
-#undef MODULE_START
-#define MODULE_START	(((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK)
+#undef MODULES_VADDR
+#define MODULES_VADDR	(((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK)
 #endif
 
 #ifdef CONFIG_MMU
@@ -43,7 +43,7 @@ void *module_alloc(unsigned long size)
 	if (!size)
 		return NULL;
 
-	area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END);
+	area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
 	if (!area)
 		return NULL;
 

arch/arm/mm/mmu.c

@@ -654,7 +654,7 @@ static inline void prepare_page_table(struct meminfo *mi)
 	/*
 	 * Clear out all the mappings below the kernel image.
 	 */
-	for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
+	for (addr = 0; addr < MODULES_VADDR; addr += PGDIR_SIZE)
 		pmd_clear(pmd_off_k(addr));
 
 #ifdef CONFIG_XIP_KERNEL
@@ -766,7 +766,7 @@ static void __init devicemaps_init(struct machine_desc *mdesc)
 	 */
 #ifdef CONFIG_XIP_KERNEL
 	map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
-	map.virtual = MODULE_START;
+	map.virtual = MODULES_VADDR;
 	map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
 	map.type = MT_ROM;
 	create_mapping(&map);

mm/vmalloc.c

@@ -178,7 +178,7 @@ static int vmap_page_range(unsigned long addr, unsigned long end,
 static inline int is_vmalloc_or_module_addr(const void *x)
 {
 	/*
-	 * x86-64 and sparc64 put modules in a special place,
+	 * ARM, x86-64 and sparc64 put modules in a special place,
 	 * and fall back on vmalloc() if that fails. Others
 	 * just put it in the vmalloc space.
 	 */