linux-kernel - Re: [PATCH v3 5/5] KVM/x86/lbr: lazy save the guest lbr stack

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Message-ID: <20180920123753.GT24124@hirez.programming.kicks-ass.net>
Date:   Thu, 20 Sep 2018 14:37:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com, ak@...ux.intel.com, kan.liang@...el.com,
        mingo@...hat.com, rkrcmar@...hat.com, like.xu@...el.com,
        jannh@...gle.com, arei.gonglei@...wei.com
Subject: Re: [PATCH v3 5/5] KVM/x86/lbr: lazy save the guest lbr stack

On Thu, Sep 20, 2018 at 06:05:59PM +0800, Wei Wang wrote:
>  /**
> + * lbr_select_user_callstack - check if the user callstack mode is set
> + *
> + * @lbr_select: the lbr select msr
> + *
> + * Returns: true if the msr is configured to the user callstack mode.
> + * Otherwise, false.
> + *
> + */
> +bool lbr_select_user_callstack(u64 lbr_select)
> +{
> +	return !!(lbr_select & LBR_USER_CALLSTACK);
> +}
> +EXPORT_SYMBOL_GPL(lbr_select_user_callstack);

That function is pure and tiny, wth is that an exported symbol and not
an inline?