linux-kernel - Re: [PATCH v1 2/6] arm64/sve: Add Perf extensions documentation

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Message-ID: <Ynk3J2Gfnm4LkHn0@sirena.org.uk>
Date:   Mon, 9 May 2022 16:45:43 +0100
From:   Mark Brown <broonie@...nel.org>
To:     James Clark <james.clark@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, german.gomez@....com,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v1 2/6] arm64/sve: Add Perf extensions documentation

On Mon, May 09, 2022 at 03:42:50PM +0100, James Clark wrote:

> +* Its value is equivalent to the current vector length (VL) in bits divided by
> +  64.

Please explicitly say that this is the current *SVE* vector length,
given that with SME entering streaming mode means we have SVE registers
with the current streaming vector length which may be different to the
SVE vector length it is possible that someone may read the above as
referring to the vector length that applies to the current Z/P registers.

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