linux-kernel - Re: [PATCH v4 2/2] locking/pvqspinlock, hv: Enable PV qspinlock for Hyper-V

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Message-ID: <20181009105427.GA102322@gmail.com>
Date:   Tue, 9 Oct 2018 12:54:27 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Yi Sun <yi.y.sun@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        jgross@...e.com, chao.p.peng@...el.com, chao.gao@...el.com,
        isaku.yamahata@...el.com, michael.h.kelley@...rosoft.com,
        tianyu.lan@...rosoft.com, "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>
Subject: Re: [PATCH v4 2/2] locking/pvqspinlock, hv: Enable PV qspinlock for
 Hyper-V


* Yi Sun <yi.y.sun@...ux.intel.com> wrote:

> Follow PV spinlock mechanism to implement the callback functions
> to allow the CPU idling and kicking operations on Hyper-V.

> +#if defined(CONFIG_SMP)
> +	smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu;
> +#endif

What's wrong with using the common pattern of:

	#ifdef CONFIG_SMP

?

Thanks,

	Ingo