linux-kernel - Re: [PATCH v2 1/2] mm/memblock: expose only miminal interface to add/walk physmem

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Message-Id: <62588A3E-81FA-4C79-B215-D1D33887597C@redhat.com>
Date:   Wed, 1 Jul 2020 17:34:54 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-mm@...ck.org,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 1/2] mm/memblock: expose only miminal interface to add/walk physmem



> Am 01.07.2020 um 17:07 schrieb Mike Rapoport <rppt@...ux.ibm.com>:
> 
> Hi David,
> 
>> On Wed, Jul 01, 2020 at 04:18:29PM +0200, David Hildenbrand wrote:
>> "physmem" in the memblock allocator is somewhat weird: it's not actually
>> used for allocation, it's simply information collected during boot, which
>> describes the unmodified physical memory map at boot time, without any
>> standby/hotplugged memory. It's only used on s390x and is currently the
>> only reason s390x keeps using CONFIG_ARCH_KEEP_MEMBLOCK.
>> 
>> Physmem isn't numa aware and current users don't specify any flags. Let's
>> hide it from the user, exposing only for_each_physmem(), and simplify. The
>> interface for physmem is now really minimalistic:
>> - memblock_physmem_add() to add ranges
>> - for_each_physmem() / __next_physmem_range() to walk physmem ranges
>> 
>> Don't place it into an __init section and don't discard it without
>> CONFIG_ARCH_KEEP_MEMBLOCK. As we're reusing __next_mem_range(), remove
>> the __meminit notifier to avoid section mismatch warnings once
>> CONFIG_ARCH_KEEP_MEMBLOCK is no longer used with
>> CONFIG_HAVE_MEMBLOCK_PHYS_MAP.
>> 
>> While fixing up the documentation, sneak in some related cleanups. We can
>> stop setting CONFIG_HAVE_MEMBLOCK_PHYS_MAP for s390x next.
> 
> As you noted in the previous version it should have been
> CONFIG_ARCH_KEEP_MEMBLOCK ;-)

Grml :) maybe maintainers can fix that up when applying in case there are no other comments.

Thanks Mike for the fast review!