linux-kernel - Re: [PATCH 1/5] serial: 8250_pci: use DEFINE_PCI_DEVICE

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Message-id: <000801ceeef2$71d23160$55769420$%han@samsung.com>
Date:	Mon, 02 Dec 2013 09:07:09 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Jingoo Han' <jg1.han@...sung.com>,
	'Joe Perches' <joe@...ches.com>,
	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Andy Whitcroft' <apw@...onical.com>,
	linux-serial@...r.kernel.org, 'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH 1/5] serial: 8250_pci: use DEFINE_PCI_DEVICE_TABLE macro

On Friday, November 29, 2013 10:34 AM, Jingoo Han wrote:
> On Thursday, November 28, 2013 3:24 PM, Joe Perches wrote:
> >On Wed, 2013-11-27 at 21:53 -0800, 'Greg Kroah-Hartman' wrote:
> >>On Wed, Nov 27, 2013 at 09:40:13PM -0800, Joe Perches wrote:
> >>>On Thu, 2013-11-28 at 14:29 +0900, Jingoo Han wrote:
> >>>>On Thursday, November 28, 2013 1:08 PM, Greg Kroah-Hartman wrote:
> >>>>>On Thu, Nov 28, 2013 at 10:55:35AM +0900, Jingoo Han wrote:
> >>>>>> This macro is used to create a struct pci_device_id array.
> >>>>>
> >>>>> Yeah, and it's a horrid macro that deserves to be removed, please don't
> >>>>> use it in more places.
> >>>>>
> >>>>> Actually, if you could just remove it, that would be best, sorry, I'm
> >>>>> not going to take these patches.
> >>>>
> >>>> (+cc Joe Perches, Andrew Morton, Andy Whitcroft)
> >>>>
> >>>> Hi Joe Perches,
> >>>>
> >>>> Would you fix checkpatch.pl about DEFINE_PCI_DEVICE_TABLE?
> >>>> Currently, checkpatch.pl guides to use DEFINE_PCI_DEVICE_TABLE
> >>>> as below.
> >>>>
> >>>>   WARNING: Use DEFINE_PCI_DEVICE_TABLE for struct pci_device_id
> >>>>   #331: FILE: drivers/usb/host/ehci-pci.c:331:
> >>>>   +static const struct pci_device_id pci_ids [] = { {
> >>>>
> >>>> However, Greg Kroah-Hartman mentioned that DEFINE_PCI_DEVICE_TABLE
> >>>> shouldn't be used anymore.
> >>>>
> >>>> So, would you change checkpatch.pl in order to guide to use
> >>>> struct pci_device_id instead of DEFINE_PCI_DEVICE_TABLE?
> >>>>
> >>>> For example,
> >>>>   WARNING: Use struct pci_device_id instead of DEFINE_PCI_DEVICE_TABLE
> >>>
> >>> The documentation doesn't agree with Greg.
> >[]
> >> I say just remove it, I should have done that years ago when I was the
> >> PCI maintainer, just never got around to it.  No other bus has something
> >> like this for their device ids, why should PCI be "special"?
> >
> >Anyone else have an opinion?
> >
> >I don't care one way or another, but please, one way
> >not two.
> 
> (+cc Bjorn Helgaas, linux-pci)
> 
> Then, how about the following steps?
> 
> 1. Fix ./Documentation/PCI/pci.txt as below.
>    (Jingoo Han)
>    The ID table is an array of struct pci_device_id entries ending with an
>    -all-zero entry; use of the macro DEFINE_PCI_DEVICE_TABLE is the preferred
>    -method of declaring the table.  Each entry consists of:
>    +all-zero entry; Each entry consists of:
> 
> 2. Fix ./scripts/checkpatch.pl in order to guide to use
>     struct pci_device_id instead of DEFINE_PCI_DEVICE_TABLE.
>     (Joe Perches)

If all DEFINE_PCI_DEVICE_TABLEs are replaced with 'const struct pci_device_id'
and these patches are merged through 'driver-core.git', it will be not
necessary to fix ./scripts/checkpatch.pl.

Then, I will send patches to Greg Kroah-Hartman, with CC'ing each subsystem
maintainer.

Best regards,
Jingoo Han

> 
> 3. Replace DEFINE_PCI_DEVICE_TABLE of ./drivers/*
>     with 'const struct pci_device_id'.
>    (Jingoo Han)
> 
> 4. These patches will be merged through 'driver-core.git'
>     with 'Acked-by' of each subsystem maintainer.
>    (Greg Kroah-Hartman)
> 
> Best regards,
> Jingoo Han
> 
> >Changing checkpatch is a trifle, but there are a _lot_
> >of maintainers to work through if it's to be removed.
> >
> >It'll probably take several releases.
> >
> >$ git grep --name-only -w DEFINE_PCI_DEVICE_TABLE | \
> >  cut -f1,2 -d/ | uniq -c
> >      1 Documentation/PCI
> >      1 arch/x86
> >      1 drivers/bcma
> >      3 drivers/block
> >      1 drivers/char
> >      1 drivers/cpufreq
> >      2 drivers/dma
> >     18 drivers/edac
> >      6 drivers/gpio
> >      6 drivers/gpu
> >      6 drivers/hwmon
> >     20 drivers/i2c
> >      2 drivers/infiniband
> >      1 drivers/ipack
> >      1 drivers/leds
> >      3 drivers/media
> >     10 drivers/mfd
> >      2 drivers/misc
> >      1 drivers/mmc
> >      1 drivers/mtd
> >    132 drivers/net
> >      1 drivers/ntb
> >      1 drivers/pci
> >      5 drivers/pcmcia
> >      2 drivers/platform
> >      1 drivers/ptp
> >      1 drivers/rapidio
> >      7 drivers/scsi
> >      3 drivers/spi
> >     65 drivers/staging
> >      3 drivers/tty
> >      1 drivers/uio
> >      5 drivers/usb
> >      1 drivers/video
> >      1 drivers/virtio
> >      3 drivers/vme
> >      9 drivers/watchdog
> >      1 drivers/xen
> >      1 include/linux
> >      1 scripts/checkpatch.pl
> >      1 scripts/tags.sh
> >      1 sound/oss
> >     67 sound/pci

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