linux-kernel - Re: [RFC] asm-generic/pci_iomap.h: make custom PCI BAR requirements explicit

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Date:	Sat, 3 Oct 2015 17:14:20 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	"Luis R. Rodriguez" <mcgrof@...e.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, arnd@...db.de,
	linux-arch@...r.kernel.org, mingo@...nel.org,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	linux-s390@...r.kernel.org, bp@...e.de, linux@...ck-us.net,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	rostedt@...dmis.org
Subject: Re: [RFC] asm-generic/pci_iomap.h: make custom PCI BAR requirements
 explicit

On 10/02/15 16:17, Luis R. Rodriguez wrote:
> On Fri, Aug 28, 2015 at 07:13:08PM -0700, Randy Dunlap wrote:
>> On 08/28/15 17:17, Luis R. Rodriguez wrote:
>>>
>>>  arch/s390/Kconfig                 |  8 +++++
>>>  arch/s390/include/asm/io.h        | 11 -------
>>>  arch/s390/include/asm/pci.h       |  2 --
>>>  arch/s390/include/asm/pci_iomap.h | 33 +++++++++++++++++++++
>>>  arch/s390/pci/pci.c               |  2 ++
>>>  include/asm-generic/io.h          | 12 --------
>>>  include/asm-generic/iomap.h       | 10 -------
>>>  include/asm-generic/pci_iomap.h   | 62 +++++++++++++++++++++++++++++++++++----
>>>  lib/Kconfig                       |  1 +
>>>  lib/pci_iomap.c                   |  5 ++++
>>>  10 files changed, 105 insertions(+), 41 deletions(-)
>>>  create mode 100644 arch/s390/include/asm/pci_iomap.h
>>>
>>> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
>>> index 1d57000b1b24..1217b7db4265 100644
>>> --- a/arch/s390/Kconfig
>>> +++ b/arch/s390/Kconfig
>>> @@ -614,6 +614,14 @@ endif	# PCI
>>>  config PCI_DOMAINS
>>>  	def_bool PCI
>>>  
>>> +config ARCH_PCI_NON_DISJUNCTIVE
>>> +	def_bool PCI
>>> +	help
>>> +	  On the S390 architecture PCI BAR spaces are not disjunctive, as such
>>
>> 	are not disjoint?  may be overlapping?
>>
>>> +	  the PCI bar is required on a series of otherwise asm generic PCI
>>> +	  routines, as such S390 requires itw own implemention for these
>>
>> 	                                  its own implementation
> 
> Thanks, I've re-written this as:
> 
> mcgrof@...on ~/linux-next (git::(no branch, rebasing 20150805-pend-all))$ git diff
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index f4725d1af438..8ba5826ed13b 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -618,10 +618,10 @@ config PCI_DOMAINS
>  config ARCH_PCI_NON_DISJUNCTIVE
>         def_bool PCI
>         help
> -         On the S390 architecture PCI BAR spaces are not disjunctive, as such
> -         the PCI bar is required on a series of otherwise asm generic PCI
> -         routines, as such S390 requires itw own implemention for these
> -         routines.
> +         On the S390 architecture PCI BAR spaces may overlap with each other,

That "other," should not end with a comma.  Either use a semi-colon or use a
period and begin the next sentence with Because.

> +         because of this the PCI bar is required on a series of otherwise asm
> +         generic PCI routines and this in turn requires S390 to provide its
> +         own implementation for these routines.
>  
>  config HAS_IOMEM
>         def_bool PCI
>>


-- 
~Randy
--
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