[patch added to 3.12-stable] x86: vvar, fix excessive gcc-6 DECLARE_VVAR warnings

This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.

===============

On 3.12, with gcc-6, I see a lot of:
arch/x86/include/asm/vvar.h:33:28: warning: ‘vvaraddr_jiffies’ defined but not used [-Wunused-const-variable]
  static type const * const vvaraddr_ ## name =   \
                            ^
arch/x86/include/asm/vvar.h:46:1: note: in expansion of macro ‘DECLARE_VVAR’
 DECLARE_VVAR(0, volatile unsigned long, jiffies)
 ^~~~~~~~~~~~

In upstream, this is fixed by ef721987ae (x86, vdso: Introduce VVAR
marco for vdso32) and f40c330091 (x86, vdso: Move the vvar and hpet
mappings next to the 64-bit vDSO). But this is not applicable to
stable.

So mark the vvar declaration as __maybe_unused and be done with it.
This will generate it to the code only if it is used. I.e. the same as
with gcc < 6.

Signed-off-by: Jiri Slaby <redacted>
Cc: Andy Lutomirski <luto@amacapital.net>
---
 arch/x86/include/asm/vvar.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index d76ac40da206..9fb01a91c013 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h

@@ -30,7 +30,7 @@
 #else
 
 #define DECLARE_VVAR(offset, type, name)				\
-	static type const * const vvaraddr_ ## name =			\
+	static type const * const vvaraddr_ ## name __maybe_unused =	\
 		(void *)(VVAR_ADDRESS + (offset));
 
 #define DEFINE_VVAR(type, name)						\

-- 
2.7.0