linux-kernel - Re: [PATCH V3 2/6] perf/core: Add helper to obtain performance counter index

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Message-ID: <20180917230758.GA3117@worktop.programming.kicks-ass.net>
Date:   Tue, 18 Sep 2018 01:07:58 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Reinette Chatre <reinette.chatre@...el.com>
Cc:     tglx@...utronix.de, fenghua.yu@...el.com, tony.luck@...el.com,
        mingo@...hat.com, acme@...nel.org, gavin.hindman@...el.com,
        jithu.joseph@...el.com, dave.hansen@...el.com, hpa@...or.com,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 2/6] perf/core: Add helper to obtain performance
 counter index

On Mon, Sep 17, 2018 at 09:37:14AM -0700, Reinette Chatre wrote:
> On 9/17/2018 1:23 AM, Peter Zijlstra wrote:

> > I said arch/x86/include/asm/perf_events.h and call it:
> > x86_perf_rdpmc_index().
> > 
> > This function is very much x86 specific.

> Moving it to arch/x86/include/asm/perf_event.h is not trivial since this
> file is not familiar with struct perf_event.

Urgh, right you are. Does it work if you make it a regular function
instead of an inline? Put the thing in arch/x86/events/core.c or so and
only an extern decl in asm/perf_event.h.