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    Subject[PATCH v2 2/2] s390/mm: don't set ARCH_KEEP_MEMBLOCK
    Date
    Commit 50be63450728 ("s390/mm: Convert bootmem to memblock") mentions
    "The original bootmem allocator is getting replaced by memblock. To
    cover the needs of the s390 kdump implementation the physical
    memory list is used."

    As we can now reference "physmem" managed in the memblock allocator after
    init even without ARCH_KEEP_MEMBLOCK, and s390x does no longer need
    other memblock metadata after boot (esp., the zcore memmap device that used
    it got removed), we can stop setting ARCH_KEEP_MEMBLOCK.

    With this change, we no longer create memblocks for standby/hotplugged
    memory (added via add_memory()) and free up memblock metdata (except
    physmem) after boot.

    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: Vasily Gorbik <gor@linux.ibm.com>
    Cc: Christian Borntraeger <borntraeger@de.ibm.com>
    Cc: Philipp Rudo <prudo@linux.ibm.com>
    Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
    Cc: Mike Rapoport <rppt@linux.ibm.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: David Hildenbrand <david@redhat.com>
    ---
    arch/s390/Kconfig | 1 -
    1 file changed, 1 deletion(-)

    diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
    index c7d7ede6300c5..7697a1f8e819a 100644
    --- a/arch/s390/Kconfig
    +++ b/arch/s390/Kconfig
    @@ -102,7 +102,6 @@ config S390
    select ARCH_INLINE_WRITE_UNLOCK_BH
    select ARCH_INLINE_WRITE_UNLOCK_IRQ
    select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
    - select ARCH_KEEP_MEMBLOCK
    select ARCH_STACKWALK
    select ARCH_SUPPORTS_ATOMIC_RMW
    select ARCH_SUPPORTS_NUMA_BALANCING
    --
    2.26.2
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