linux-kernel - Re: [PATCH v13 8/9] nvmet-passthru: Add enable/disable helpers

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Message-ID: <078ffd88-d2f9-bfa1-5a81-97abe0b66653@deltatee.com>
Date:   Thu, 11 Jun 2020 17:24:30 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v13 8/9] nvmet-passthru: Add enable/disable helpers



On 2020-06-11 5:13 p.m., Chaitanya Kulkarni wrote:
> On 5/14/20 10:23 AM, Logan Gunthorpe wrote:
>> +	if (subsys->ver < NVME_VS(1, 2, 1)) {
>> +		pr_warn("nvme controller version is too old: %d.%d.%d, advertising 1.2.1\n",
> Is it more than 80 char ? can it be ?
>                   pr_warn("nvme controller version is too old: ");
>                   pr_warn("%d.%d.%d, advertising 1.2.1\n",

Splitting printks is a bad idea because they won't necessarily end up in
dmesg right next to each other -- other prints can be interleaved.
Moreover, it breaks any tools that are dealing with kernel logs as
single records (ie through /dev/kmsg). Continuations (or printks without
a trailing "\n") would require using pr_cont() and generally that's
discouraged.

>> +			(int)NVME_MAJOR(subsys->ver),
>> +			(int)NVME_MINOR(subsys->ver),
>> +			(int)NVME_TERTIARY(subsys->ver));
>> +		subsys->ver = NVME_VS(1, 2, 1);
>> +	}
> 
> NVMe blktests are running on QEMU based controller. This will generate 
> warning every-time.

Yup.

> Also, I didn't understand int type cast, I wonder under what condition 
> all these macros will return -ve values since ver of type u64 ?

Yes, I'm not sure what I was thinking when I put in the cast. Probably
better just to prints "%llu". I'll fix this for the next revision.

Thanks,

Logan