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From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Yunsheng Lin <linyunsheng@huawei.com>,
	dalias@libc.org, linux-sh@vger.kernel.org,
	catalin.marinas@arm.com, dave.hansen@linux.intel.com,
	heiko.carstens@de.ibm.com, linuxarm@huawei.com,
	jiaxun.yang@flygoat.com, linux-kernel@vger.kernel.org,
	mwb@linux.vnet.ibm.com, paulus@samba.org, hpa@zytor.com,
	sparclinux@vger.kernel.org, chenhc@lemote.com, will@kernel.org,
	linux-s390@vger.kernel.org, ysato@users.sourceforge.jp,
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	linux-alpha@vger.kernel.org, bp@alien8.de,
	akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
	davem@davemloft.net,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [PATCH v2 2/9] x86: numa: check the node id consistently for x86
Date: Mon, 2 Sep 2019 21:14:21 +0200
Message-ID: <20190902191421.GT2369@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190902182252.GC35858@gmail.com>

On Mon, Sep 02, 2019 at 08:22:52PM +0200, Ingo Molnar wrote:
> 
> * Peter Zijlstra <peterz@infradead.org> wrote:

> > diff --git a/drivers/base/core.c b/drivers/base/core.c
> > index f0dd8e38fee3..2caf204966a0 100644
> > --- a/drivers/base/core.c
> > +++ b/drivers/base/core.c
> > @@ -2120,8 +2120,16 @@ int device_add(struct device *dev)
> >  		dev->kobj.parent = kobj;
> >  
> >  	/* use parent numa_node */
> > -	if (parent && (dev_to_node(dev) == NUMA_NO_NODE))
> > -		set_dev_node(dev, dev_to_node(parent));
> > +	if (dev_to_node(dev) == NUMA_NO_NODE) {
> > +		if (parent)
> > +			set_dev_node(dev, dev_to_node(parent));
> > +#ifdef CONFIG_NUMA
> > +		else {
> > +			pr_err("device: '%s': has no assigned NUMA node\n", dev_name(dev));
> > +			set_dev_node(dev, 0);
> > +		}
> > +#endif
> 
> BTW., is firmware required to always provide a NUMA node on NUMA systems?
> 
> I.e. do we really want this warning on non-NUMA systems that don't assign 
> NUMA nodes?

Good point; we might have to exclude nr_node_ids==1 systems from
warning.

> Also, even on NUMA systems, is firmware required to provide a NUMA node - 
> i.e. is it in principle invalid to offer no NUMA binding?

I think so; a device needs to be _somewhere_, right? Typically though;
devices are on a PCI bus, and the PCI bridge itself will have a NUMA
binding and then the above parent rule will make everything just work.

But I don't see how you can be outside of the NUMA topology.

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-31  5:58 [PATCH v2 0/9] check the node id consistently across different arches Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 1/9] arm64: numa: check the node id consistently for arm64 Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 2/9] x86: numa: check the node id consistently for x86 Yunsheng Lin
2019-08-31  8:55   ` Peter Zijlstra
2019-08-31 10:09     ` Yunsheng Lin
2019-08-31 16:12       ` Peter Zijlstra
2019-09-01  4:45         ` Something about loongson_llsc_mb 陈华才
     [not found]           ` <2019090410032559707512@loongson.cn>
2019-09-04  9:21             ` Peter Zijlstra
2019-09-04 10:04               ` Peter Zijlstra
2019-09-04 12:57               ` Huang Pei
2019-09-02  5:46         ` [PATCH v2 2/9] x86: numa: check the node id consistently for x86 Yunsheng Lin
2019-09-02  7:25           ` Peter Zijlstra
2019-09-02 12:25             ` Yunsheng Lin
2019-09-02 12:56               ` Peter Zijlstra
2019-09-02 18:22                 ` Ingo Molnar
2019-09-02 19:14                   ` Peter Zijlstra [this message]
2019-09-03  6:19                 ` Yunsheng Lin
2019-09-03  7:11                   ` Peter Zijlstra
2019-09-03  8:31                     ` Yunsheng Lin
2019-09-02 18:17             ` Ingo Molnar
2019-09-03  7:53               ` [PATCH] x86/mm: Fix cpumask_of_node() error condition Peter Zijlstra
2019-08-31  5:58 ` [PATCH v2 3/9] alpha: numa: check the node id consistently for alpha Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 4/9] powerpc: numa: check the node id consistently for powerpc Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 5/9] s390: numa: check the node id consistently for s390 Yunsheng Lin
2019-09-02  4:05   ` kbuild test robot
2019-08-31  5:58 ` [PATCH v2 6/9] sh: numa: check the node id consistently for sh Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 7/9] sparc64: numa: check the node id consistently for sparc64 Yunsheng Lin
2019-08-31  6:53   ` David Miller
2019-08-31  8:57     ` Yunsheng Lin
2019-08-31 20:02       ` David Miller
2019-09-02  6:08         ` Yunsheng Lin
2019-09-02 15:17           ` David Miller
2019-08-31  5:58 ` [PATCH v2 8/9] mips: numa: check the node id consistently for mips ip27 Yunsheng Lin
2019-08-31  5:58 ` [PATCH v2 9/9] mips: numa: check the node id consistently for mips loongson64 Yunsheng Lin

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