From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: 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-mips@vger.kernel.org,
mwb@linux.vnet.ibm.com, paulus@samba.org, hpa@zytor.com,
sparclinux@vger.kernel.org, chenhc@lemote.com, will@kernel.org,
bp@alien8.de, linux-s390@vger.kernel.org,
ysato@users.sourceforge.jp, x86@kernel.org, paul.burton@mips.com,
rppt@linux.ibm.com, borntraeger@de.ibm.com, dledford@redhat.com,
mingo@redhat.com, jeffrey.t.kirsher@intel.com, jhogan@kernel.org,
nfont@linux.vnet.ibm.com, mattst88@gmail.com,
len.brown@intel.com, gor@linux.ibm.com,
anshuman.khandual@arm.com,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
ink@jurassic.park.msu.ru, luto@kernel.org, tglx@linutronix.de,
naveen.n.rao@linux.vnet.ibm.com,
linux-arm-kernel@lists.infradead.org, rth@twiddle.net,
axboe@kernel.dk, linuxppc-dev@lists.ozlabs.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-kernel@vger.kernel.org, ralf@linux-mips.org,
tbogendoerfer@suse.de, Yunsheng Lin <linyunsheng@huawei.com>,
linux-alpha@vger.kernel.org, cai@lca.pw,
akpm@linux-foundation.org, robin.murphy@arm.com,
davem@davemloft.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 [thread overview]
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.
next prev parent reply other threads:[~2019-09-02 19:17 UTC|newest]
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
2019-09-02 5:46 ` 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
2019-09-03 12:15 ` Salil Mehta
2019-09-03 14:28 ` Peter Zijlstra
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 15:45 ` Paul Burton
2019-09-02 6:11 ` 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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