From: Yunsheng Lin <linyunsheng@huawei.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Greg KH <gregkh@linuxfoundation.org>, <rafael@kernel.org>,
<linux-kernel@vger.kernel.org>, <peterz@infradead.org>,
<mingo@kernel.org>, <linuxarm@huawei.com>
Subject: Re: [PATCH] driver core: ensure a device has valid node id in device_add()
Date: Wed, 11 Sep 2019 19:03:30 +0800 [thread overview]
Message-ID: <d828d48c-cae7-f3c2-fb2e-c8b25995cbef@huawei.com> (raw)
In-Reply-To: <20190911073451.GM4023@dhcp22.suse.cz>
On 2019/9/11 15:34, Michal Hocko wrote:
> On Wed 11-09-19 15:22:30, Yunsheng Lin wrote:
> [...]
>> It seems that there is no protection that prevent setting the node
>> of device to an invalid node.
>> And the kernel does have a few different check now:
>> 1) some does " < 0" check;
>> 2) some does "== NUMA_NO_NODE" check;
>> 3) some does ">= MAX_NUMNODES" check;
>> 4) some does "< 0 || >= MAX_NUMNODES || !node_online(node)" check.
>>
>> We need to be consistent about the checking, right?
>
> You can try and chase each of them and see what to do with them. I
> suspect they are a result of random attempts to fortify the code in many
> cases. Consistency is certainly good but spreading more checks all over
> the place just adds more cargo cult. Each check should be reasonably
> justified.
Ok, Let me focus on making the node_to_cpumask_map() NUMA_NO_NODE aware
by only checking "node == NUMA_NO_NODE" first.
>
next prev parent reply other threads:[~2019-09-11 11:04 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 [this message]
2019-09-11 11:41 ` Yunsheng Lin
2019-09-11 12:02 ` Michal Hocko
2019-09-23 15:09 ` Peter Zijlstra
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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