linux-kernel - Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO

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Message-ID: <20191029085336.GF31513@dhcp22.suse.cz>
Date:   Tue, 29 Oct 2019 09:53:36 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Robin Murphy <robin.murphy@....com>, catalin.marinas@....com,
        will@...nel.org, mingo@...hat.com, bp@...en8.de, rth@...ddle.net,
        ink@...assic.park.msu.ru, mattst88@...il.com,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        heiko.carstens@...ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, ysato@...rs.sourceforge.jp,
        dalias@...c.org, davem@...emloft.net, ralf@...ux-mips.org,
        paul.burton@...s.com, jhogan@...nel.org, jiaxun.yang@...goat.com,
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        anshuman.khandual@....com, tglx@...utronix.de, cai@....pw,
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        linux-pci@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        lenb@...nel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware

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@...r.kernel.org and linux-acpi@...r.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