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From: John Garry <>
To: Christoph Hellwig <>, Jens Axboe <>
Cc: Sagi Grimberg <>,
	Chaitanya Kulkarni <>,
	<>, <>,
	"Ahmed S. Darwish" <>,
	Keith Busch <>
Subject: Re: v5.9-rc1 commit reliably breaks pci nvme detection
Date: Fri, 21 Aug 2020 08:28:03 +0100
Message-ID: <> (raw)
In-Reply-To: <>

On 20/08/2020 18:12, Christoph Hellwig wrote:
> On Thu, Aug 20, 2020 at 11:10:58AM -0600, Jens Axboe wrote:
>> To be fair, I've only heard this one complaint about it, so hopefully it's
>> not too widespread. I'm on an x86-64 laptop myself with nvme, and it works
>> just fine:-)
> The cause for this is the weird NVMe of by ones, where 0 in a field
> means 1.

I thought that this was a common trick by spec writers to fit a number 
in range (0, 2^x] in x bits (as opposed to x+1).

      parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-17 13:50 Ahmed S. Darwish
2020-08-17 15:56 ` Keith Busch
2020-08-17 15:58   ` Jens Axboe
2020-08-20 15:35     ` Jens Axboe
2020-08-20 17:07       ` Ahmed S. Darwish
2020-08-20 17:10         ` Jens Axboe
2020-08-20 17:12           ` Christoph Hellwig
2020-08-20 17:14             ` Jens Axboe
2020-08-21  7:28             ` John Garry [this message]

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