linux-kernel - Re: [PATCH v9 7/9] coresight: add support for CPU debug module

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Message-ID: <20170512001010.GA13845@leoy-ThinkPad-T440>
Date:   Fri, 12 May 2017 08:10:11 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Jonathan Corbet <corbet@....net>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Wei Xu <xuwei5@...ilicon.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Stephen Boyd <sboyd@...eaurora.org>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        Mike Leach <mike.leach@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v9 7/9] coresight: add support for CPU debug module

On Thu, May 11, 2017 at 11:12:32AM -0600, Mathieu Poirier wrote:

[...]

> > +static int debug_probe(struct amba_device *adev, const struct amba_id *id)
> > +{
> > +	void __iomem *base;
> > +	struct device *dev = &adev->dev;
> > +	struct debug_drvdata *drvdata;
> > +	struct resource *res = &adev->res;
> > +	struct device_node *np = adev->dev.of_node;
> > +	int ret;
> > +
> > +	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> > +	if (!drvdata)
> > +		return -ENOMEM;
> > +
> > +	drvdata->cpu = np ? of_coresight_get_cpu(np) : 0;
> > +	if (per_cpu(debug_drvdata, drvdata->cpu)) {
> > +		dev_err(dev, "CPU%d drvdata has been initialized, "
> 
> s/"has been"/"has already been"
> 
> That way it really look like an error message.

Will fix.

> Also debug_probe() uses dev_xyz() but everywhere else in the driver it is
> pr_xyz() - any specific reason for that?  I suggest moving to dev_xyz().

Some logs are shared for all device instances, so I think should use
pr_xyz(); will spin a new version to change other places to use
dev_xyz() if the logs are for specific device instance.

> Otherwise things look good.

[...]

Thanks,
Leo Yan