linux-kernel - Re: [PATCH v2 3/6] coresight: Introduce support for Coresight Address Translation Unit

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Date:   Mon, 25 Jun 2018 09:23:51 -0700
From:   Joe Perches <joe@...ches.com>
To:     Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org,
        robh@...nel.org, frowand.list@...il.com, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/6] coresight: Introduce support for Coresight
 Address Translation Unit

On Mon, 2018-06-25 at 12:22 +0100, Suzuki K Poulose wrote:
> Add the initial support for Coresight Address Translation Unit, which
> augments the TMC in Coresight SoC-600 by providing an improved Scatter
> Gather mechanism. CATU is always connected to a single TMC-ETR and
> converts the AXI address with a translated address (from a given SG
> table with specific format). The CATU should be programmed in pass
> through mode and enabled even if the ETR doesn't use the translation
> by CATU.
[]
> diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h
[]
> +static inline bool coresight_is_catu_device(struct coresight_device *csdev)
> +{
> +	enum coresight_dev_subtype_helper subtype;
> +
> +	/* Make the checkpatch happy */
> +	subtype = csdev->subtype.helper_subtype;
> +
> +	return IS_ENABLED(CONFIG_CORESIGHT_CATU) &&
> +	       csdev->type == CORESIGHT_DEV_TYPE_HELPER &&
> +	       subtype == CORESIGHT_DEV_SUBTYPE_HELPER_CATU;
> +}

I believe you should not make checkpatch happy here
by using a temporary but use the most readable form.

Probably the most readable form is:

	return IS_ENABLED(CONFIG_CORESIGHT_CATU) &&
	       csdev->type == CORESIGHT_DEV_TYPE_HELPER &&
	       csdev->subtype.helper_subtype == CORESIGHT_DEV_SUBTYPE_HELPER_CATU;

where restricting line length to 80 columns is not useful
because the identifiers are very long.  The identifiers
are possibly longer than necessary.