linux-kernel - Re: [PATCH] arm64, pci, numa: Adding helper functions as required by pci

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Date:	Mon, 11 Jan 2016 18:12:12 +0100
From:	Matthias Brugger <mbrugger@...e.com>
To:	Ganapatrao Kulkarni <gpkulkarni@...il.com>,
	Bjorn Helgaas <helgaas@...nel.org>
Cc:	Prasun Kapoor <Prasun.Kapoor@...iumnetworks.com>,
	linux-pci@...r.kernel.org, Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Robert Richter <rrichter@...ium.com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64, pci, numa: Adding helper functions as required by
 pci

On 09/01/16 16:35, Ganapatrao Kulkarni wrote:
> Hi Bjorn,
>
> On Sat, Jan 9, 2016 at 8:54 PM, Bjorn Helgaas <helgaas@...nel.org> wrote:
>> On Sat, Jan 09, 2016 at 11:35:17AM +0530, Ganapatrao Kulkarni wrote:
>>> On Fri, Jan 8, 2016 at 11:36 PM, Will Deacon <will.deacon@....com> wrote:
>>>> On Fri, Jan 08, 2016 at 12:01:31PM -0600, Bjorn Helgaas wrote:
>>>>> On Tue, Dec 22, 2015 at 04:08:50PM +0530, Ganapatrao Kulkarni wrote:
>>>>>> Adding helper functions and necessary code to make
>>>>>> pci driver(pci-host-generic) numa aware.
>>>>>>
>>>>>> This patch is on top of arm64-numa v7.
>>>>>> http://www.spinics.net/lists/arm-kernel/msg460813.html
>>>>>>
>>>>>> Signed-off-by: Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>
>>>>>> ---
>>>>>>   arch/arm64/include/asm/numa.h       | 8 +++++---
>>>>>>   arch/arm64/kernel/pci.c             | 8 ++++++++
>>>>>>   drivers/pci/host/pci-host-generic.c | 1 +

set_dev_node() in pci-host-generic.c is missing in v8 of your numa patches.
Was this forgotten?

Regards,
Matthias

>>>>>>   3 files changed, 14 insertions(+), 3 deletions(-)
>>>>>>
>>>>>> diff --git a/arch/arm64/include/asm/numa.h b/arch/arm64/include/asm/numa.h
>>>>>> index b8c2a3f..1eca4db 100644
>>>>>> --- a/arch/arm64/include/asm/numa.h
>>>>>> +++ b/arch/arm64/include/asm/numa.h
>>>>>> @@ -15,9 +15,11 @@
>>>>>>   extern int __node_distance(int from, int to);
>>>>>>   #define node_distance(a, b) __node_distance(a, b)
>>>>>>
>>>>>> -/* dummy definitions for pci functions */
>>>>>> -#define pcibus_to_node(node)       0
>>>>>> -#define cpumask_of_pcibus(bus)     0
>>>>>> +struct pci_bus;
>>>>>> +extern int pcibus_to_node(struct pci_bus *bus);
>>>>>> +#define cpumask_of_pcibus(bus)     (pcibus_to_node(bus) == -1 ?            \
>>>>>> +                            cpu_all_mask :                         \
>>>>>> +                            cpumask_of_node(pcibus_to_node(bus)))
>>>>>
>>>>> All the arch definitions of cpumask_of_pcibus() are pretty similar;
>>>>> could they be made more generic?  At the very least, can you drop the
>>>>> definition here and use the one in include/asm-generic/topology.h,
>>>>> which is identical to what you're defining here?
>>> macro cpumask_of_pcibus is defined under #ifndef CONFIG_NUMA in
>>> include/asm-generic/topology.h
>>> and this macro is defined again for NUMA in respective arch header files.
>>> i think moving this macro from ifndef will allow us to use without redefinition.
>>>
>>> --- a/include/asm-generic/topology.h
>>> +++ b/include/asm-generic/topology.h
>>> @@ -54,14 +54,14 @@
>>>   #define pcibus_to_node(bus)    ((void)(bus), -1)
>>>   #endif
>>>
>>> +#endif /* CONFIG_NUMA */
>>> +
>>>   #ifndef cpumask_of_pcibus
>>>   #define cpumask_of_pcibus(bus) (pcibus_to_node(bus) == -1 ?            \
>>>                                   cpu_all_mask :                         \
>>>                                   cpumask_of_node(pcibus_to_node(bus)))
>>>   #endif
>>>
>>> -#endif /* CONFIG_NUMA */
>>> -
>>>   #if !defined(CONFIG_NUMA) || !defined(CONFIG_HAVE_MEMORYLESS_NODES)
>>>
>>>   #ifndef set_numa_mem
>>>
>>> i have got below compilation error withour macro defined in arch code.
>>>
>>> drivers/pci/pci-sysfs.c: In function ‘cpuaffinity_show’:
>>> drivers/pci/pci-sysfs.c:114:15: error: implicit declaration of
>>> function ‘cpumask_of_pcibus’ [-Werror=implicit-function-declaration]
>>> drivers/pci/pci-sysfs.c:114:34: warning: initialization makes pointer
>>> from integer without a cast [enabled by default]
>>> drivers/pci/pci-sysfs.c: In function ‘cpulistaffinity_show’:
>>> drivers/pci/pci-sysfs.c:123:34: warning: initialization makes pointer
>>> from integer without a cast [enabled by default]
>>> cc1: some warnings being treated as errors
>>>
>>>
>>> i can send this as separate patch( as a  fix patch).
>>
>> Unless your series has already been merged, I don't like the idea of a
>> separate fix patch.  The whole point of reviews is to try to fix as
>> many things as we can *before* merging.
> thanks for the review.
> sure, i will add  this as part of my numa patch series.
>>
>> Bjorn
>
> thanks
> Ganapat
>
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