linux-kernel - Re: [PATCH RFC 2/6] x86/hyper-v: add a function to read both TSC and TSC page value simulateneously

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Message-ID: <20171201092904.30d9831f@xeon-e3>
Date:   Fri, 1 Dec 2017 09:29:04 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, x86@...nel.org,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH RFC 2/6] x86/hyper-v: add a function to read both TSC
 and TSC page value simulateneously

On Fri,  1 Dec 2017 14:13:17 +0100
Vitaly Kuznetsov <vkuznets@...hat.com> wrote:

> +
> +static inline u64 hv_read_tsc_page_tsc(const struct ms_hyperv_tsc_page *tsc_pg,
> +				       u64 *cur_tsc)
> +{
> +	*cur_tsc = rdtsc();
> +
> +	return cur_tsc;

Why do return and setting by reference. Looks like an ugly API.