On Mon, Apr 03, 2017 at 11:23:55AM +0900, AKASHI Takahiro wrote:
> Add memblock_cap_memory_range() which will remove all the memblock regions
> except the memory range specified in the arguments. In addition, rework is
> done on memblock_mem_limit_remove_map() to re-implement it using
> memblock_cap_memory_range().
>
> This function, like memblock_mem_limit_remove_map(), will not remove
> memblocks with MEMMAP_NOMAP attribute as they may be mapped and accessed
> later as "device memory."
> See the commit a571d4eb55d8 ("mm/memblock.c: add new infrastructure to
> address the mem limit issue").
>
> This function is used, in a succeeding patch in the series of arm64 kdump
> suuport, to limit the range of usable memory, or System RAM, on crash dump
> kernel.
> (Please note that "mem=" parameter is of little use for this purpose.)
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> Reviewed-by: Will Deacon <will.deacon@xxxxxxx>
> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> Acked-by: Dennis Chen <dennis.chen@xxxxxxx>
> Cc: linux-mm@xxxxxxxxx
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
> ---
> include/linux/memblock.h | 1 +
> mm/memblock.c | 44 +++++++++++++++++++++++++++++---------------
> 2 files changed, 30 insertions(+), 15 deletions(-)
Andrew, are you ok with patches 1 and 2 in this series (touching
mm/memblock.c and include/linux/memblock.h) to go in via the arm64 tree?
Thanks.
--
Catalin
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