linux-kernel - Re: [PATCH V2 1/3] mm/hotplug: Prevalidate the address range being added with platform

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Message-ID: <556a8a62-7bb2-d16b-67ea-57c87c1a6aa7@redhat.com>
Date:   Tue, 12 Jan 2021 11:09:34 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        Oscar Salvador <osalvador@...e.de>
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org, hca@...ux.ibm.com,
        catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Will Deacon <will@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH V2 1/3] mm/hotplug: Prevalidate the address range being
 added with platform

On 12.01.21 04:51, Anshuman Khandual wrote:
> 
> 
> On 1/11/21 7:13 PM, Oscar Salvador wrote:
>> On Mon, Jan 11, 2021 at 11:51:47AM +0100, David Hildenbrand wrote:
>>> AFAIKs, all memhp_get_pluggable_range() users pass "1".
>>>
>>> What about the "add_pages()-only" path?
>>
>> I guess you refer to memremap_pages(), right?
> 
> Right, via pagemap_range().
> 
>> If so, moving the added memhp_range_allowed() check above the if-else might do
>> the trick
>>
> We had that code in the earlier version. But dropped it, as we did
> not want to add any new checks in the generic code. Can add it back
> if that is preferred.

I remember discussing replacing the check in __add_pages() instead. But
I don't really care where the check ends up being. As discussed, at some
point, we should provide versions of add_pages() and arch_add_pages()
that don't immediately end in arch-code.

-- 
Thanks,

David / dhildenb