linux-kernel - Re: [PATCH 3/3] nvme: fix eui

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Date:   Fri, 03 Nov 2017 08:16:37 -0700
From:   Joe Perches <joe@...ches.com>
To:     Christoph Hellwig <hch@....de>,
        Javier González <jg@...htnvm.io>
Cc:     sagi@...mberg.me, keith.busch@...el.com,
        linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Javier González <javier@...xlabs.com>
Subject: Re: [PATCH 3/3] nvme: fix eui_show() print format

On Fri, 2017-11-03 at 13:55 +0100, Christoph Hellwig wrote:
> On Fri, Nov 03, 2017 at 11:02:50AM +0100, Javier González wrote:
> > Signed-off-by: Javier González <javier@...xlabs.com>
[]
> > diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
[]
> > @@ -2108,7 +2108,7 @@ static ssize_t eui_show(struct device *dev, struct device_attribute *attr,
> >  								char *buf)
> >  {
> >  	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
> > -	return sprintf(buf, "%8phd\n", ns->eui);
> > +	return sprintf(buf, "%8phD\n", ns->eui);
> >  }
> >  static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL);
> 
> This looks correct.  I wonder what the old code printed - does someone
> have a device with an EUI-64 at hand to quickly cross check what we
> did before?

It uses spaces between bytes and not dashes.

The code has been this way a couple years now.

I think this proposal, while it might fix an
unintentional output style, could also be an API
and could cause user breakage if changed.

Perhaps this should just become

	%8ph

without D