linux-kernel - Re: [PATCHv2 4/4] nvme: add disk name to tracepoints

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Date:   Fri, 29 Jun 2018 10:00:08 +0200
From:   Christoph Hellwig <hch@....de>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 4/4] nvme: add disk name to tracepoints

> +const char *nvme_trace_disk_name(struct trace_seq *p, char *name)
> +{
> +	const char *ret = trace_seq_buffer_ptr(p);
> +
> +	if (name[0] != 0)
> +		trace_seq_printf(p, "disk=%-.*s, ", DISK_NAME_LEN, name);

	if (*name)
		trace_seq_printf(p, "disk=%-.*s, ", DISK_NAME_LEN, name);

?

> +		    req->rq_disk ?
> +			memcpy(__entry->disk, req->rq_disk->disk_name, DISK_NAME_LEN) :
> +			memset(__entry->disk, 0, DISK_NAME_LEN);

Make this a helper please.