netdev - Re: [PATCH net-next 3/3] net/smc: Introduce tracepoint for smcr link down

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Message-ID: <11f17a34-fd35-f2ec-3f20-dd0c34e55fde@linux.ibm.com>
Date:   Tue, 2 Nov 2021 10:30:22 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     Tony Lu <tonylu@...ux.alibaba.com>
Cc:     kuba@...nel.org, davem@...emloft.net, guwen@...ux.alibaba.com,
        dust.li@...ux.alibaba.com, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] net/smc: Introduce tracepoint for smcr link
 down

On 01/11/2021 08:39, Tony Lu wrote:
> +
> +	    TP_printk("lnk=%p lgr=%p state=%d dev=%s location=%p",
> +		      __entry->lnk, __entry->lgr,
> +		      __entry->state, __get_str(name),
> +		      __entry->location)

The location is printed as pointer (which might even be randomized?),
is it possible to print the function name of the caller, as described
here: https://stackoverflow.com/questions/4141324/function-caller-in-linux-kernel

  printk("Caller is %pS\n", __builtin_return_address(0));

Not sure if this is possible with the trace points, but it would be
easier to use. You plan to use a dump to find out about the function caller?