linux-kernel - RE: [PATCH v6 18/19] x86: Add support for generic vDSO

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Message-ID: <BYAPR21MB135202F46C4B023B51EBBFD0D7E00@BYAPR21MB1352.namprd21.prod.outlook.com>
Date:   Mon, 24 Jun 2019 00:04:06 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Sasha Levin <sashal@...nel.org>
CC:     Vincenzo Frascino <vincenzo.frascino@....com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Huw Davies <huw@...eweavers.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: RE: [PATCH v6 18/19] x86: Add support for generic vDSO

From: Thomas Gleixner <tglx@...utronix.de> Sent: Sunday, June 23, 2019 3:13 PM
> 
> I have no objections if you collect hyper-v stuff, quite the contrary, but
> changes which touch other subsystems need to be coordinated upfront. That's
> all I'm asking for.
> 
> Btw, that clocksource stuff looks good code wise, just the change logs need
> some care and after the VDSO stuff hits next we need to sort out the
> logistics. I hope these changes are completely self contained. If not we'll
> find a solution.
>

In my view, the only thing that potentially needs a solution is where the
Hyper-V clock code used by VDSO ends up in the code tree.  I think the
right long term place is include/clocksource/hyperv_timer.h.   That location
is architecture neutral, and the same Hyper-V clock code will be shared by
the Hyper-V on ARM64 support that's in process.

Vincenzo's patch set creates a new file arch/x86/include/asm/mshyperv-tsc.h,
which I will want to move when creating the separate Hyper-V clocksource
driver.   If you're OK with that file existing for a release and then going away,
that's fine.  Alternatively, put the code in include/clocksource/hyperv_timer.h
now as part of the VDSO patch set so it's in the right place from the start.  My
subsequent patch set will add a few additional tweaks to remove x86-isms
and fully integrate with the separate Hyper-V clocksource driver.

Michael