[Devel] [PATCH RH7 1/9] Port: diff-fence-watchdog-introduce-fencing-watchdog-for-HA-cluster-3

[Pavel Tikhomirov]

> diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
> index de656ac..1ae9a5c 100644
> --- a/arch/x86/include/asm/vvar.h
> +++ b/arch/x86/include/asm/vvar.h
> @@ -45,6 +45,7 @@
>
>   DECLARE_VVAR(0, volatile unsigned long, jiffies)
>   DECLARE_VVAR(16, int, vgetcpu_mode)
> +DECLARE_VVAR(64, volatile unsigned long, fence_wdog_jiffies64)
>   DECLARE_VVAR(128, struct vsyscall_gtod_data, vsyscall_gtod_data)
>
>   #undef DECLARE_VVAR

I couldn't find reason why here are such big offsets between variables 
in commit messages, so I asked Andy Lutomirski, who introduced vvar.h, 
and he said that there is no good reason now, and he put variables like 
this to keep them cacheline-aligned and to avoid worrying about space - 
"there's 4k of space, so keeping everything compact serves no purpose."

-- 
Best regards, Tikhomirov Pavel
Software Developer, Odin.