linux-kernel - Re: [PATCH v2 1/2] mm: memblock: enforce overlap of memory.memblock and memory.reserved

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Message-ID: <X9HqWd97rmIkOzLX@kroah.com>
Date:   Thu, 10 Dec 2020 10:28:57 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Baoquan He <bhe@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>, Qian Cai <cai@....pw>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, stable@...r.kernel.org
Subject: Re: [PATCH v2 1/2] mm: memblock: enforce overlap of memory.memblock
 and memory.reserved

On Wed, Dec 09, 2020 at 11:43:03PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> memblock does not require that the reserved memory ranges will be a subset
> of memblock.memory.
> 
> As the result there maybe reserved pages that are not in the range of any
> zone or node because zone and node boundaries are detected based on
> memblock.memory and pages that only present in memblock.reserved are not
> taken into account during zone/node size detection.
> 
> Make sure that all ranges in memblock.reserved are added to memblock.memory
> before calculating node and zone boundaries.
> 
> Fixes: 73a6e474cb37 ("mm: memmap_init: iterate over memblock regions rather that check each PFN")
> Reported-by: Andrea Arcangeli <aarcange@...hat.com>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>  include/linux/memblock.h |  1 +
>  mm/memblock.c            | 24 ++++++++++++++++++++++++
>  mm/page_alloc.c          |  7 +++++++
>  3 files changed, 32 insertions(+)


<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>