linux-kernel - Re: [PATCH 2/3] perf/arm-cmn: Rework DTC counters (again)

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Date:   Mon, 23 Oct 2023 10:06:17 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Ilkka Koskinen <ilkka@...amperecomputing.com>
Cc:     Robin Murphy <robin.murphy@....com>, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jeremy.linton@....com, renyu.zj@...ux.alibaba.com
Subject: Re: [PATCH 2/3] perf/arm-cmn: Rework DTC counters (again)

On Fri, Oct 20, 2023 at 03:50:30PM -0700, Ilkka Koskinen wrote:
> Hi Robin,
> 
> I have one comment, otherwise the patch looks good to me.

> > +/* @i is the DTC number, @idx is the counter index on that DTC */
> > +#define for_each_hw_dtc_idx(hw, i, idx) \
> > +	for (int i = 0, idx; i < CMN_MAX_DTCS; i++) if ((idx = hw->dtc_idx[i]) >= 0)
> 
> Isn't that "idx" unnecessary in the initialization?

That creates the 'idx' variable that's assigned to by `idx = hw->dtc_idx[i]`,
so that is necessary.

Mark.