[PATCH] add __[start|end]_rodata sections to asm-generic/sections.h

Add __start_rodata and __end_rodata to sections.h to avoid extern
declarations.  Needed by s390 code (see following patch).

[akpm@osdl.org: update architectures]
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/mm/init.c

@@ -725,16 +725,15 @@ static int noinline do_test_wp_bit(void)
 
 #ifdef CONFIG_DEBUG_RODATA
 
-extern char __start_rodata, __end_rodata;
 void mark_rodata_ro(void)
 {
-	unsigned long addr = (unsigned long)&__start_rodata;
+	unsigned long addr = (unsigned long)__start_rodata;
 
-	for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
+	for (; addr < (unsigned long)__end_rodata; addr += PAGE_SIZE)
 		change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO);
 
-	printk ("Write protecting the kernel read-only data: %luk\n",
-			(unsigned long)(&__end_rodata - &__start_rodata) >> 10);
+	printk("Write protecting the kernel read-only data: %uk\n",
+			(__end_rodata - __start_rodata) >> 10);
 
 	/*
 	 * change_page_attr() requires a global_flush_tlb() call after it.

arch/parisc/mm/init.c

@@ -27,6 +27,7 @@
 #include <asm/tlb.h>
 #include <asm/pdc_chassis.h>
 #include <asm/mmzone.h>
+#include <asm/sections.h>
 
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
@@ -417,11 +418,10 @@ void free_initmem(void)
 #ifdef CONFIG_DEBUG_RODATA
 void mark_rodata_ro(void)
 {
-	extern char __start_rodata, __end_rodata;
 	/* rodata memory was already mapped with KERNEL_RO access rights by
            pagetable_init() and map_pages(). No need to do additional stuff here */
 	printk (KERN_INFO "Write protecting the kernel read-only data: %luk\n",
-		(unsigned long)(&__end_rodata - &__start_rodata) >> 10);
+		(unsigned long)(__end_rodata - __start_rodata) >> 10);
 }
 #endif
 

arch/x86_64/mm/init.c

@@ -678,16 +678,15 @@ void free_initmem(void)
 
 #ifdef CONFIG_DEBUG_RODATA
 
-extern char __start_rodata, __end_rodata;
 void mark_rodata_ro(void)
 {
-	unsigned long addr = (unsigned long)&__start_rodata;
+	unsigned long addr = (unsigned long)__start_rodata;
 
-	for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
+	for (; addr < (unsigned long)__end_rodata; addr += PAGE_SIZE)
 		change_page_attr_addr(addr, 1, PAGE_KERNEL_RO);
 
 	printk ("Write protecting the kernel read-only data: %luk\n",
-			(&__end_rodata - &__start_rodata) >> 10);
+			(__end_rodata - __start_rodata) >> 10);
 
 	/*
 	 * change_page_attr_addr() requires a global_flush_tlb() call after it.

include/asm-generic/sections.h

@@ -14,5 +14,6 @@ extern char _end[];
 extern char __per_cpu_start[], __per_cpu_end[];
 extern char __kprobes_text_start[], __kprobes_text_end[];
 extern char __initdata_begin[], __initdata_end[];
+extern char __start_rodata[], __end_rodata[];
 
 #endif /* _ASM_GENERIC_SECTIONS_H_ */