linux-kernel - Duplication of vdso and vsyscall code?

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Date:	Fri, 09 Oct 2009 14:15:58 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Duplication of vdso and vsyscall code?

arch/x86/kernel/vsyscall_64.c implements vgettimeofday and vgetcpu. 
(And vtime)

arch/x86/vdso/vclock_gettime.c implements __vdso_gettimeofday (and
__vdso_clock_gettime), and vgetcpu.c has __vdso_getcpu.

These appear to be functionally identical duplicate definitions.   I
don't understand the history here to know how we came to get two sets of
these functions, but surely we can share the same code for both of these?

Thanks,
    J
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