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From: Michal Hocko <mhocko@kernel.org>
To: Yunsheng Lin <linyunsheng@huawei.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Robin Murphy <robin.murphy@arm.com>,
	catalin.marinas@arm.com, will@kernel.org, mingo@redhat.com,
	bp@alien8.de, rth@twiddle.net, ink@jurassic.park.msu.ru,
	mattst88@gmail.com, benh@kernel.crashing.org, paulus@samba.org,
	mpe@ellerman.id.au, heiko.carstens@de.ibm.com, gor@linux.ibm.com,
	borntraeger@de.ibm.com, ysato@users.sourceforge.jp,
	dalias@libc.org, davem@davemloft.net, ralf@linux-mips.org,
	paul.burton@mips.com, jhogan@kernel.org, jiaxun.yang@flygoat.com,
	chenhc@lemote.com, akpm@linux-foundation.org, rppt@linux.ibm.com,
	anshuman.khandual@arm.com, tglx@linutronix.de, cai@lca.pw,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, hpa@zytor.com, x86@kernel.org,
	dave.hansen@linux.intel.com, luto@kernel.org,
	len.brown@intel.com, axboe@kernel.dk, dledford@redhat.com,
	jeffrey.t.kirsher@intel.com, linux-alpha@vger.kernel.org,
	naveen.n.rao@linux.vnet.ibm.com, mwb@linux.vnet.ibm.com,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
	tbogendoerfer@suse.de, linux-mips@vger.kernel.org,
	rafael@kernel.org, bhelgaas@google.com,
	linux-pci@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	lenb@kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware
Date: Tue, 29 Oct 2019 09:53:36 +0100
Message-ID: <20191029085336.GF31513@dhcp22.suse.cz> (raw)
In-Reply-To: <1ec704df-97a5-04b7-1f20-8e3db19440a3@huawei.com>

On Mon 28-10-19 17:20:33, Yunsheng Lin wrote:
> On 2019/10/12 15:40, Greg KH wrote:
> > On Sat, Oct 12, 2019 at 02:17:26PM +0800, Yunsheng Lin wrote:
> >> add pci and acpi maintainer
> >> cc linux-pci@vger.kernel.org and linux-acpi@vger.kernel.org
> >>
> >> On 2019/10/11 19:15, Peter Zijlstra wrote:
> >>> On Fri, Oct 11, 2019 at 11:27:54AM +0800, Yunsheng Lin wrote:
> >>>> But I failed to see why the above is related to making node_to_cpumask_map()
> >>>> NUMA_NO_NODE aware?
> >>>
> >>> Your initial bug is for hns3, which is a PCI device, which really _MUST_
> >>> have a node assigned.
> >>>
> >>> It not having one, is a straight up bug. We must not silently accept
> >>> NO_NODE there, ever.
> >>>
> >>
> >> I suppose you mean reporting a lack of affinity when the node of a pcie
> >> device is not set by "not silently accept NO_NODE".
> > 
> > If the firmware of a pci device does not provide the node information,
> > then yes, warn about that.
> > 
> >> As Greg has asked about in [1]:
> >> what is a user to do when the user sees the kernel reporting that?
> >>
> >> We may tell user to contact their vendor for info or updates about
> >> that when they do not know about their system well enough, but their
> >> vendor may get away with this by quoting ACPI spec as the spec
> >> considering this optional. Should the user believe this is indeed a
> >> fw bug or a misreport from the kernel?
> > 
> > Say it is a firmware bug, if it is a firmware bug, that's simple.
> > 
> >> If this kind of reporting is common pratice and will not cause any
> >> misunderstanding, then maybe we can report that.
> > 
> > Yes, please do so, that's the only way those boxes are ever going to get
> > fixed.  And go add the test to the "firmware testing" tool that is based
> > on Linux that Intel has somewhere, to give vendors a chance to fix this
> > before they ship hardware.
> > 
> > This shouldn't be a big deal, we warn of other hardware bugs all the
> > time.
> 
> Hi, all.
> 
> The warning for the above case has been added in [1].
> 
> So maybe it makes sense to make node_to_cpumask_map() NUMA_NO_NODE aware
> now?
> 
> If Yes, this patch still can be applied to the latest linus' tree cleanly,
> Do I need to resend it?
> 

By this patch you mean http://lkml.kernel.org/r/1568724534-146242-1-git-send-email-linyunsheng@huawei.com
right?

I would just resend it unless there is still a clear disagreement over
it.

> [1] https://lore.kernel.org/linux-pci/1571467543-26125-1-git-send-email-linyunsheng@huawei.com/

-- 
Michal Hocko
SUSE Labs

  reply index

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-17 12:48 Yunsheng Lin
2019-09-23 15:15 ` Peter Zijlstra
2019-09-23 15:28   ` Michal Hocko
2019-09-23 15:48     ` Peter Zijlstra
2019-09-23 16:52       ` Michal Hocko
2019-09-23 20:34         ` Peter Zijlstra
2019-09-24  1:29           ` Yunsheng Lin
2019-09-24  9:25             ` Peter Zijlstra
2019-09-24 11:07               ` Yunsheng Lin
2019-09-24 11:28                 ` Peter Zijlstra
2019-09-24 11:44                   ` Yunsheng Lin
2019-09-24 11:58                     ` Peter Zijlstra
2019-09-24 12:09                       ` Yunsheng Lin
2019-09-24  7:47           ` Michal Hocko
2019-09-24  9:17             ` Peter Zijlstra
2019-09-24 10:56               ` Michal Hocko
2019-09-24 11:23                 ` Peter Zijlstra
2019-09-24 11:54                   ` Michal Hocko
2019-09-24 12:09                     ` Peter Zijlstra
2019-09-24 12:25                       ` Michal Hocko
2019-09-24 12:43                         ` Peter Zijlstra
2019-09-24 12:59                           ` Peter Zijlstra
2019-09-24 13:19                             ` Michal Hocko
2019-09-25  9:14                               ` Yunsheng Lin
2019-09-25 10:41                                 ` Peter Zijlstra
2019-10-08  8:38                                   ` Yunsheng Lin
2019-10-09 12:25                                     ` Robin Murphy
2019-10-10  6:07                                       ` Yunsheng Lin
2019-10-10  7:32                                         ` Michal Hocko
2019-10-11  3:27                                           ` Yunsheng Lin
2019-10-11 11:15                                             ` Peter Zijlstra
2019-10-12  6:17                                               ` Yunsheng Lin
2019-10-12  7:40                                                 ` Greg KH
2019-10-12  9:47                                                   ` Yunsheng Lin
2019-10-12 10:40                                                     ` Greg KH
2019-10-12 10:47                                                       ` Greg KH
2019-10-14  8:00                                                         ` Yunsheng Lin
2019-10-14  9:25                                                           ` Greg KH
2019-10-14  9:49                                                             ` Peter Zijlstra
2019-10-14 10:04                                                               ` Greg KH
2019-10-15 10:40                                                             ` Yunsheng Lin
2019-10-15 16:58                                                               ` Greg KH
2019-10-16 12:07                                                                 ` Yunsheng Lin
2019-10-28  9:20                                                   ` Yunsheng Lin
2019-10-29  8:53                                                     ` Michal Hocko [this message]
2019-10-30  1:58                                                       ` Yunsheng Lin
2019-10-10  8:56                                       ` Peter Zijlstra
2019-09-25 10:40                               ` Peter Zijlstra
2019-09-25 13:25                                 ` Michal Hocko
2019-09-25 16:31                                   ` Peter Zijlstra
2019-09-25 21:45                                     ` Peter Zijlstra
2019-09-26  9:05                                       ` Peter Zijlstra
2019-09-26 12:10                                         ` Peter Zijlstra

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