From: Peter Zijlstra <peterz@infradead.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Yunsheng Lin <linyunsheng@huawei.com>,
Greg KH <gregkh@linuxfoundation.org>,
rafael@kernel.org, linux-kernel@vger.kernel.org,
mingo@kernel.org, linuxarm@huawei.com
Subject: Re: [PATCH] driver core: ensure a device has valid node id in device_add()
Date: Mon, 23 Sep 2019 17:09:42 +0200 [thread overview]
Message-ID: <20190923150942.GD2369@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190911064926.GJ4023@dhcp22.suse.cz>
On Wed, Sep 11, 2019 at 08:49:26AM +0200, Michal Hocko wrote:
> On Wed 11-09-19 14:15:51, Yunsheng Lin wrote:
> > >>>>>> When passing the return value of dev_to_node() to cpumask_of_node()
> > >>>>>> without checking the node id if the node id is not valid, there is
> > >>>>>> global-out-of-bounds detected by KASAN as below:
> > >>>>>
> > >>>>> OK, I seem to remember this being brought up already. And now when I
> > >>>>> think about it, we really want to make cpumask_of_node NUMA_NO_NODE
> > >>>>> aware. That means using the same trick the allocator does for this
> > >>>>> special case.
> No. Please read the above paragraph again. NUMA_NO_NODE really means no
> node affinity. So all cpus should be usable. Making any assumptions
> about a local context is just wrong.
So none of this makes sense to me. How can a device have NUMA_NO_NODE on
a NUMA machine. It needs to have a physical presence _somwhere_; and
that cannot be equidistant from all CPUs.
Please explain how this makes physical sense.
next prev parent reply other threads:[~2019-09-23 15:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 6:04 [PATCH] driver core: ensure a device has valid node id in device_add() Yunsheng Lin
2019-09-09 9:53 ` Greg KH
2019-09-10 6:43 ` Yunsheng Lin
2019-09-10 7:13 ` Michal Hocko
2019-09-10 9:31 ` Greg KH
2019-09-10 10:58 ` Yunsheng Lin
2019-09-10 11:04 ` Michal Hocko
2019-09-10 11:12 ` Greg KH
2019-09-10 12:47 ` Yunsheng Lin
2019-09-10 12:53 ` Michal Hocko
2019-09-11 5:33 ` Michal Hocko
2019-09-11 6:15 ` Yunsheng Lin
2019-09-11 6:49 ` Michal Hocko
2019-09-11 7:22 ` Yunsheng Lin
2019-09-11 7:34 ` Michal Hocko
2019-09-11 11:03 ` Yunsheng Lin
2019-09-11 11:41 ` Yunsheng Lin
2019-09-11 12:02 ` Michal Hocko
2019-09-23 15:09 ` Peter Zijlstra [this message]
2019-09-09 18:50 ` Michal Hocko
2019-09-10 7:08 ` Yunsheng Lin
2019-09-10 7:24 ` Michal Hocko
2019-09-10 10:40 ` Yunsheng Lin
2019-09-10 11:01 ` Michal Hocko
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