3.12-stable review patch. If anyone has any objections, please let me 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 <jslaby@xxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
---
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) \
--
2.7.1
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