Re: [PATCH 12/12] mips: Enable OF_RESERVED_MEM config

[Christoph Hellwig]

On Wed, Apr 24, 2019 at 01:47:48AM +0300, Serge Semin wrote:
> Since memblock-patchset was introduced the reserved-memory nodes are
> supported being declared in dt-files. So these nodes are actually parsed
> during the arch setup procedure when the early_init_fdt_scan_reserved_mem()
> method is called. But some of the features like private reserved memory
> pools aren't available at the moment, since OF_RESERVED_MEM isn't enabled
> for the MIPS platform. Lets fix it by enabling the config.
> 
> But due to the arch-specific boot mem_map container utilization we need
> to manually call the fdt_init_reserved_mem() method after all the available
> and reserved memory has been moved to memblock. The function call performed
> before bootmem_init() fails due to the lack of any memblock memory regions
> to allocate from at that stage.

Architectures should not select this symbol directly, it will be
automatically enabled if either DMA_DECLARE_COHERENT or DMA_CMA
are enabled, which are required for the actual underlying memory
allocators.