linux-kernel - Re: [PATCH] of: introduce event tracepoints for dynamic device

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Date:   Wed, 19 Apr 2017 22:13:13 -0700
From:   Frank Rowand <frowand.list@...il.com>
To:     Tyrel Datwyler <turtle.in.the.kernel@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>, robh+dt@...nel.org
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, nfont@...ux.vnet.ibm.com,
        rostedt@...dmis.org, mingo@...hat.com
Subject: Re: [PATCH] of: introduce event tracepoints for dynamic device_node
 lifecyle

On 04/19/17 21:43, Frank Rowand wrote:
> On 04/19/17 16:27, Tyrel Datwyler wrote:
>> On 04/18/2017 06:31 PM, Michael Ellerman wrote:

< snip >

>>
>> To get that same info as far as I know is to add a dump_stack() after
>> each pr_debug.
> 
> Here is a patch that I have used.  It is not as user friendly in terms
> of human readable stack traces (though a very small user space program
> should be able to fix that).  The patch is cut and pasted into this
> email, so probably white space damaged.

< snip >

> +
> +	if (node) {
> +		int k;
> +		int refcount = refcount_read(&node->kobj.kref.refcount);
> +		pr_err("XXX get 0x%p %3d [0x%08lx 0x%08lx 0x%08lx 0x%08lx 0x%08lx 0x%08lx] ",
> +			node, refcount,

If this was a real patch, meant for people other than myself, the
pr_err() would instead be pr_debug().

-Frank

< snip >