On Mon, Jun 25, 2018 at 09:23:51AM -0700, Joe Perches wrote:

On Mon, 2018-06-25 at 12:22 +0100, Suzuki K Poulose wrote:

quoted

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.

[]

quoted

diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h

[]

quoted

+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.

I would prefer to avoid adding code that will trigger checkpatch warnings.  I
suggest the following:

static inline bool coresight_is_catu_device(struct coresight_device *csdev)
{
        if (!IS_ENABLED(CONFIG_CORESIGHT_CATU))
                return false;

        if (csdev->type != CORESIGHT_DEV_TYPE_HELPER)
                return false;

        if (csdev->subtype.helper_subtype != CORESIGHT_DEV_SUBTYPE_HELPER_CATU)
                return false;

        return true;
}

No temporary variable and all shorther than 80 columns.

Thanks,
Mathieu