[PATCH v2 09/13] arm, arm64: move free_unused_memmap() to generic mm

[Catalin Marinas]

On Sun, Nov 01, 2020 at 07:04:50PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt at linux.ibm.com>
> 
> ARM and ARM64 free unused parts of the memory map just before the
> initialization of the page allocator. To allow holes in the memory map both
> architectures overload pfn_valid() and define HAVE_ARCH_PFN_VALID.
> 
> Allowing holes in the memory map for FLATMEM may be useful for small
> machines, such as ARC and m68k and will enable those architectures to cease
> using DISCONTIGMEM and still support more than one memory bank.
> 
> Move the functions that free unused memory map to generic mm and enable
> them in case HAVE_ARCH_PFN_VALID=y.
> 
> Signed-off-by: Mike Rapoport <rppt at linux.ibm.com>

For arm64:

Acked-by: Catalin Marinas <catalin.marinas at arm.com>