linux-kernel - Re: [RFC][PATCH] time: Add warning about imminent deprecation of CONFIG_GENERIC_TIME_VSYSCALL

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Date:   Tue, 23 May 2017 06:45:50 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     John Stultz <john.stultz@...aro.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Miroslav Lichvar <mlichvar@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Prarit Bhargava <prarit@...hat.com>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Anton Blanchard <anton@...ba.org>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: Re: [RFC][PATCH] time: Add warning about imminent deprecation of
 CONFIG_GENERIC_TIME_VSYSCALL_OLD

On Mon, 2017-05-22 at 12:06 -0700, John Stultz wrote:
> So, long ago I talked w/ Paul Mackerras about the ppc vdso code, as
> ppc has some other legacy "userspace time" code that has to be
> maintained as well (I believe there's not code page, just data page
> that userspace pulls directly from).

Hrm... the ppc VDSO has a code page, userspace just calls
__kernel_clock_*

I don't know if anything still uses the direct mapped values, we should
enquire internally.

Cheers,
Ben.