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

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Message-Id: <2AC384A2-C792-45AF-AF11-89CBC128C527@lightnvm.io>
Date:   Sat, 4 Nov 2017 12:22:20 +0100
From:   Javier González <jg@...htnvm.io>
To:     Joe Perches <joe@...ches.com>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <keith.busch@...el.com>,
        linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] nvme: fix eui_show() print format

> On 3 Nov 2017, at 16.16, Joe Perches <joe@...ches.com> wrote:
> 
> 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

That would be ok with me.

Javier.

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