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

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Date:   Mon, 24 Oct 2016 17:06:20 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Michal Marek <mmarek@...e.com>,
        Adam Borowski <kilobyte@...band.pl>,
        Omar Sandoval <osandov@...ndov.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        adobriyan@...il.com, sfr@...b.auug.org.au, viro@...iv.linux.org.uk,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: [PATCH 2/2, variant A] ARM: add hidden mmioset/mmiocpy prototypes

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@...il.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>

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