[PATCH 2/2, variant A] ARM: add hidden mmioset/mmiocpy prototypes

[Arnd Bergmann]

The prototypes for mmioset/mmiocpy are intentionally hidden
inside of inline functions, which breaks the EXPORT_SYMBOL
statements when symbol versioning is enabled.

This adds a prototype to asm/asm-prototypes.h but hides it
in an #ifdef so normal drivers don't see it and won't be
able to abuse the interface.

Suggested-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

diff --git a/arch/arm/include/asm/asm-prototypes.h b/arch/arm/include/asm/asm-prototypes.h
index 04e5616a7b15..e46b09536b14 100644
--- a/arch/arm/include/asm/asm-prototypes.h
+++ b/arch/arm/include/asm/asm-prototypes.h
@@ -32,3 +32,8 @@ extern void __muldi3(void);
 extern void __ucmpdi2(void);
 extern void __udivsi3(void);
 extern void __umodsi3(void);
+
+#ifdef __GENKSYMS__
+extern void mmioset(void *, unsigned int, size_t);
+extern void mmiocpy(void *, const void *, size_t);
+#endif