asm-generic: Consolidate mark_rodata_ro()

Instead of defining mark_rodata_ro() in each architecture, consolidate it.

Signed-off-by: Kees Cook <[e-mail]>
Acked-by: Will Deacon <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Cc: Andy Gross <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Ard Biesheuvel <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Ashok Kumar <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Cc: Brian Gerst <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: Dan Williams <[e-mail]>
Cc: David Brown <[e-mail]>
Cc: David Hildenbrand <[e-mail]>
Cc: Denys Vlasenko <[e-mail]>
Cc: Emese Revfy <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Cc: Helge Deller <[e-mail]>
Cc: James E.J. Bottomley <[e-mail]>
Cc: Linus Torvalds <[e-mail]>
Cc: Luis R. Rodriguez <[e-mail]>
Cc: Marc Zyngier <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mathias Krause <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Nicolas Pitre <[e-mail]>
Cc: PaX Team <[e-mail]>
Cc: Paul Gortmaker <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Ross Zwisler <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: Rusty Russell <[e-mail]>
Cc: Stephen Boyd <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Toshi Kani <[e-mail]>
Cc: [e-mail]
Cc: linux-arch <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Cc: [e-mail]
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ingo Molnar <[e-mail]>

arch/arm/include/asm/cacheflush.h

···
 #endif
 
 #ifdef CONFIG_DEBUG_RODATA
-void mark_rodata_ro(void);
 void set_kernel_text_rw(void);
 void set_kernel_text_ro(void);
 #else

arch/arm64/include/asm/cacheflush.h

···
 int set_memory_x(unsigned long addr, int numpages);
 int set_memory_nx(unsigned long addr, int numpages);
 
-#ifdef CONFIG_DEBUG_RODATA
-void mark_rodata_ro(void);
-#endif
-
 #endif

arch/parisc/include/asm/cacheflush.h

···
 	}
 }
 
-#ifdef CONFIG_DEBUG_RODATA
-void mark_rodata_ro(void);
-#endif
-
 #include <asm/kmap_types.h>
 
 #define ARCH_HAS_KMAP

arch/x86/include/asm/cacheflush.h

···
 #define mmio_flush_range(addr, size) clflush_cache_range(addr, size)
 
 #ifdef CONFIG_DEBUG_RODATA
-void mark_rodata_ro(void);
 extern const int rodata_test_data;
 extern int kernel_set_to_readonly;
 void set_kernel_text_rw(void);

include/linux/init.h

···
 void __init load_default_modules(void);
 int __init init_rootfs(void);
 
+#ifdef CONFIG_DEBUG_RODATA
+void mark_rodata_ro(void);
+#endif
+
 extern void (*late_time_init)(void);
 
 extern bool initcall_debug;