linux-kernel - Re: + hugetlb-fix-section-mismatch-warning-in-hugetlbc.patch added to -mm tree

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Date:	Fri, 8 Jan 2010 12:34:15 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org
Subject: Re: + hugetlb-fix-section-mismatch-warning-in-hugetlbc.patch added to 
	-mm tree

On 1/8/10, Randy Dunlap <randy.dunlap@...cle.com> wrote:

Hi,
>
> Hi,
>
>  If so, then hugetlb_register_node() could be called at any time
>  (like after system init), and it would then call
>  hugetlb_sysfs_add_hstate(), which would be bad.
>
But - hugetlb_register_node is only called from hugetlb_register_all_nodes.
The call sequence is :
                    hugetlb_init   --------------->  was __init
                         \-> hugetlb_register_all_nodes  ----> we make it __init
                                          \-> hugetlb_register_node
---> we make it __init
                                                 \->
hugetlb_sysfs_add_hstate -> this was __init

Above all happens in __init context. So - hugetlb_register_node is
called only at
system init. But I don't think __init is used for hotplug support, for
proper hotplug
support we might use __meminit.

And register_hugetlbfs_with_node is called from hugetlb_un/register_node.
But hugetlb_unregister_node doesn't use callback function. It's not referencing
hugetlb_sysfs_add_hstate(). So - it's safe. Unless I'm not missing
anything, too.

thanks,

>  Thanks.
> ---
>
> ~Randy
>
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