linux-kernel - Re: [PATCH v1 1/3] x86/pvclock: add setter for pvclock_pvti_cpu0

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Date:   Thu, 26 Jan 2017 09:25:04 -0800
From:   Andy Lutomirski <luto@...capital.net>
To:     Joao Martins <joao.m.martins@...cle.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        xen-devel <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH v1 1/3] x86/pvclock: add setter for pvclock_pvti_cpu0_va

On Wed, Jan 25, 2017 at 9:33 AM, Joao Martins <joao.m.martins@...cle.com> wrote:
> Right now there is only a pvclock_pvti_cpu0_va() which is defined
> on kvmclock since:
>
> commit dac16fba6fc5
> ("x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap")
>
> The only user of this interface was kvm. This commit moves
> pvclock_pvti_cpu0_va to pvclock which is a more generic place to have it
> and adds the correspondent setter routine for it. This allows other
> pvclock-based clocksources to use it, such as Xen.

With a minor nit:

Acked-by: Andy Lutomirski <luto@...nel.org>

> +#else
> +static inline void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *pvti)
> +{
> +}

How about just not providing pvclock_set_pvti_cpu0_va() in this case?
It'll save three lines of code, and, more importantly, it will force
us to notice if we screw up the Kconfig stuff.