linux-kernel - Re: [PATCH v4 2/3] PCI: Allow specifying devices using a base bus and path of devfns

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Date:   Fri, 22 Jun 2018 14:50:18 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Randy Dunlap <rdunlap@...radead.org>, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-doc@...r.kernel.org
Cc:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christian König <christian.koenig@....com>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v4 2/3] PCI: Allow specifying devices using a base bus and
 path of devfns



On 22/06/18 02:01 PM, Randy Dunlap wrote:
>> Thus, we add an option to specify devices in the following format:
>>
>> [<domain>:]<bus>:<slot>.<func>[/<slot>.<func>]*
> 
> Please explain the trailing '*'.  I looked thru the code and it doesn't
> seem to look for it or care.

This was Willy's suggestion and I liked it. It's similar to regular
expression syntax: the '*' indicating you may have any number of the
expression repeated in the square brackets.

Logan