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

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Message-ID: <136bf09b-d0a4-1588-801f-bffccb3e6f4@os.amperecomputing.com>
Date:   Tue, 24 Oct 2023 20:18:59 -0700 (PDT)
From:   Ilkka Koskinen <ilkka@...amperecomputing.com>
To:     Mark Rutland <mark.rutland@....com>
cc:     Ilkka Koskinen <ilkka@...amperecomputing.com>,
        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 Mon, 23 Oct 2023, Mark Rutland wrote:

> 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.

Uh, it clearly does that. I have absoutely no idea what I was thinking 
about here. Sorry about the confusion!

--Ilkka

>
> Mark.
>